• We've upgraded our forums. Please post any issues/requests in this thread.

What to look for in a new PSU?

ny_driver

New Member
Joined
Dec 28, 2006
Messages
777 (0.19/day)
Likes
28
Location
central new york
System Name Overclock_Machine
Processor DFI LP UT nF4 SLI-DR Expert
Motherboard Opteron 146(3746MHz)
Cooling A/C Chiller w/ mod-Apogee XT/EK-FC4890 Special Edition
Memory 2 x 512MB OCZ Gold VX PC4000
Video Card(s) HD4890-Sapphire OC Edition
Display(s) Acer G235H-23" LCD
Case no, thanks
Audio Device(s) integrated
Power Supply Corsair TX-850w
Software Tiny7/XP
Benchmark Scores 6.625Ghz 965BE - CPU-Z 25,607 points 3dmark06 - 2 cards@952/1050
#1
Given my specs I want to make sure everything will have enough power when it's OC. There are many PSU to choose from and the prices vary greatly. I'd like to order one from new-egg tomorrow but like I said I don't know what I need. Any advice will be most appreciated:respect:
 

KennyT772

New Member
Joined
Dec 21, 2005
Messages
3,572 (0.82/day)
Likes
102
System Name Raptor
Processor Intel E8400 Wolfdale @3600
Motherboard Asus P5Q-Pro LGA775
Cooling Zalman CNPS9700
Memory 1024mbx2 Crucial Ballistix DDR800
Video Card(s) XFX 9600GT
Storage Seagate 7200.11 500GB
Display(s) Acer AL2216Wbd and Acer AL1717
Case Gigabyte 3DAurora Black
Audio Device(s) Creative X-Fi Extreme Gamer Faitality
Power Supply OCZ GameXStream 500w
#2
well look for a good consumer rating along with explanations of why. i am a big fan of thermal take power supplys, and just recently i purchased a hiper 580w unit. i would actually reccoment that to you also. the psu was about $85 when i ordered it. they have a bunch of other colors too.

http://www.newegg.com/Product/Product.asp?Item=N82E16817128002
 

ny_driver

New Member
Joined
Dec 28, 2006
Messages
777 (0.19/day)
Likes
28
Location
central new york
System Name Overclock_Machine
Processor DFI LP UT nF4 SLI-DR Expert
Motherboard Opteron 146(3746MHz)
Cooling A/C Chiller w/ mod-Apogee XT/EK-FC4890 Special Edition
Memory 2 x 512MB OCZ Gold VX PC4000
Video Card(s) HD4890-Sapphire OC Edition
Display(s) Acer G235H-23" LCD
Case no, thanks
Audio Device(s) integrated
Power Supply Corsair TX-850w
Software Tiny7/XP
Benchmark Scores 6.625Ghz 965BE - CPU-Z 25,607 points 3dmark06 - 2 cards@952/1050
#3
That looks nice but I really want something cheaper. I am not looking for something to build off of in the future, just something to make sure the power is not an issue in my current system when it is highly overclocked.
 

KennyT772

New Member
Joined
Dec 21, 2005
Messages
3,572 (0.82/day)
Likes
102
System Name Raptor
Processor Intel E8400 Wolfdale @3600
Motherboard Asus P5Q-Pro LGA775
Cooling Zalman CNPS9700
Memory 1024mbx2 Crucial Ballistix DDR800
Video Card(s) XFX 9600GT
Storage Seagate 7200.11 500GB
Display(s) Acer AL2216Wbd and Acer AL1717
Case Gigabyte 3DAurora Black
Audio Device(s) Creative X-Fi Extreme Gamer Faitality
Power Supply OCZ GameXStream 500w
#4
well if you want to put your system at risk go for it. i ran my x1800/3200+ system off a thermaltake 420w psu for almost a year and she was solid. the 12v rail was stable but under load it would dip to 11.6v.
 

_33

New Member
Joined
Mar 25, 2006
Messages
1,248 (0.29/day)
Likes
31
Location
Quebec
System Name BEAST
Processor Intel Core i7 920 C0 Quad Core Processor LGA1366 2.66GHZ Bloomfield 8MB LGA batch 3844A509
Motherboard ASUS P6T Deluxe V2 X58 ATX LGA1366 DDR3
Cooling CoolIt ECO A.L.C. 120mm radiator
Memory G.SKILL F3-12800CL8TU-6GBPI PC3-12800 6GB 3X2GB DDR3-1600 CL8-8-8-21
Video Card(s) Sapphire Radeon HD 4890 1GB 850MHZ 1GB 3.9GHZ GDDR5 PCI-E 2XDVI HDTV
Storage SAMSUNG SPINPOINT F1 750GB X 2, WD2500KS 250GB, WD15EARS 1.5TB, WD20EARS 2.0TB
Display(s) LG W2361V-PF Monitors 23” Widescreen LCD Monitor (23.0” diagonal)
Case Cooler Master CM 690 II Advanced
Power Supply Thermaltake Toughpower 600W Power Supply ATX V2.2 20/24PIN EPS12V Qfan 140MM Fan Active PFC
Software Windows 7 Pro 64bit
#5
You could always look for a good company, like OCZ, ThermalTake (Toughpower series), Antec (Truepower series), Enermax (some rare good ones), Raidmax (good prices, decent reviews), Silverstone (the top of the line IMHO).

Next, you want many 12 volt lines. Usually, they now come up with 3 or 4 lines. The good thing with multiple 12v lines is that when one peripheral uses max wattage out of one 12v line, the others don't suffer. It's much better than a single 12v line. That is the reason I switched from a class B PSU to my new TT Toughpower 600. It's rock solid power for my system. Before I used to hear my fans go slower when I launched games / 3D apps, and my voltages use to fluctuate a lot. Now with this new quality PSU, it's always stable and no fluctuation. Also note, a light weight PSU is always sign of cheapness.

You could always look for separate wires that you then plug in the PSU at your leasure, so you don't get tons of wiring in the box for nothing.

Depending on your forecasted consumption, check between 600 and 850 watts. 600 watts should be enough for most configurations, SLI / crossfire, dual core, and all those HDDs and DVD / CD drives, and the USB power. 850 watts would probably be good for dual R600 / 8800GTX card setup.

I suggest to choose wisely!
 

KennyT772

New Member
Joined
Dec 21, 2005
Messages
3,572 (0.82/day)
Likes
102
System Name Raptor
Processor Intel E8400 Wolfdale @3600
Motherboard Asus P5Q-Pro LGA775
Cooling Zalman CNPS9700
Memory 1024mbx2 Crucial Ballistix DDR800
Video Card(s) XFX 9600GT
Storage Seagate 7200.11 500GB
Display(s) Acer AL2216Wbd and Acer AL1717
Case Gigabyte 3DAurora Black
Audio Device(s) Creative X-Fi Extreme Gamer Faitality
Power Supply OCZ GameXStream 500w
#6
hey _33 multi-rail units are not generally better power supplys. it all depends on the design. some multi-rail designs completely separate the various rails so if one is maxed out and the other has no draw you are wasting half your power. other designs have capped draw per rail but will still share current right up to the cap.

single rail designs are still the general favorite design by overclockers as no matter what you can use every watt available. either way posting a question about a certain psu will give you a good about of feedback from that unit.
 

_33

New Member
Joined
Mar 25, 2006
Messages
1,248 (0.29/day)
Likes
31
Location
Quebec
System Name BEAST
Processor Intel Core i7 920 C0 Quad Core Processor LGA1366 2.66GHZ Bloomfield 8MB LGA batch 3844A509
Motherboard ASUS P6T Deluxe V2 X58 ATX LGA1366 DDR3
Cooling CoolIt ECO A.L.C. 120mm radiator
Memory G.SKILL F3-12800CL8TU-6GBPI PC3-12800 6GB 3X2GB DDR3-1600 CL8-8-8-21
Video Card(s) Sapphire Radeon HD 4890 1GB 850MHZ 1GB 3.9GHZ GDDR5 PCI-E 2XDVI HDTV
Storage SAMSUNG SPINPOINT F1 750GB X 2, WD2500KS 250GB, WD15EARS 1.5TB, WD20EARS 2.0TB
Display(s) LG W2361V-PF Monitors 23” Widescreen LCD Monitor (23.0” diagonal)
Case Cooler Master CM 690 II Advanced
Power Supply Thermaltake Toughpower 600W Power Supply ATX V2.2 20/24PIN EPS12V Qfan 140MM Fan Active PFC
Software Windows 7 Pro 64bit
#7
hey _33 multi-rail units are not generally better power supplys. it all depends on the design. some multi-rail designs completely separate the various rails so if one is maxed out and the other has no draw you are wasting half your power. other designs have capped draw per rail but will still share current right up to the cap.

single rail designs are still the general favorite design by overclockers as no matter what you can use every watt available. either way posting a question about a certain psu will give you a good about of feedback from that unit.
Have you ever seen a 800 watt PSU single rail? Come on. I come back here and post after what, 2 months. Here comes those lessoning guys again.

Chow.
 

ny_driver

New Member
Joined
Dec 28, 2006
Messages
777 (0.19/day)
Likes
28
Location
central new york
System Name Overclock_Machine
Processor DFI LP UT nF4 SLI-DR Expert
Motherboard Opteron 146(3746MHz)
Cooling A/C Chiller w/ mod-Apogee XT/EK-FC4890 Special Edition
Memory 2 x 512MB OCZ Gold VX PC4000
Video Card(s) HD4890-Sapphire OC Edition
Display(s) Acer G235H-23" LCD
Case no, thanks
Audio Device(s) integrated
Power Supply Corsair TX-850w
Software Tiny7/XP
Benchmark Scores 6.625Ghz 965BE - CPU-Z 25,607 points 3dmark06 - 2 cards@952/1050
#8

pt

not a suicide-bomber
Joined
Mar 11, 2006
Messages
8,956 (2.09/day)
Likes
167
Location
Portugal
Processor AMD Turion 64 X2 Mobile TL-60 (Trinidad)
Motherboard ASUS F3Ka (ATI RS690M)
Cooling stock
Memory Nanya 2x1GB ddr2 667@5-5-5-15-2T
Video Card(s) ATI Mobility Radeon HD2600 512MB DDR2@ 580mhz/486mhz
Storage 160GB on laptop+250GB external
Display(s) ASUS 15.4
Case Asus Laptop F3Ka chassis
Audio Device(s) on-board
Power Supply 1:30minutes battery
Software "genui xp", 'cause i hated vista
#9
Have you ever seen a 800 watt PSU single rail? Come on. I come back here and post after what, 2 months. Here comes those lessoning guys again.

Chow.
?
it has been said and proved that a single rail with a high A is better than multiple rails with lower A ;)
 

ny_driver

New Member
Joined
Dec 28, 2006
Messages
777 (0.19/day)
Likes
28
Location
central new york
System Name Overclock_Machine
Processor DFI LP UT nF4 SLI-DR Expert
Motherboard Opteron 146(3746MHz)
Cooling A/C Chiller w/ mod-Apogee XT/EK-FC4890 Special Edition
Memory 2 x 512MB OCZ Gold VX PC4000
Video Card(s) HD4890-Sapphire OC Edition
Display(s) Acer G235H-23" LCD
Case no, thanks
Audio Device(s) integrated
Power Supply Corsair TX-850w
Software Tiny7/XP
Benchmark Scores 6.625Ghz 965BE - CPU-Z 25,607 points 3dmark06 - 2 cards@952/1050
#10
?
it has been said and proved that a single rail with a high A is better than multiple rails with lower A ;)
so is the one I showed a single rail high A or no...please explain:confused:

EDIT:looks like it is to me
 
Last edited:

Guttboy

New Member
Joined
Dec 26, 2006
Messages
291 (0.07/day)
Likes
1
Location
Colorado
System Name First Build 2009
Processor Intel E8400 (E0) 3.0GHz
Motherboard Gigabyte GA-EP45-UD3P
Cooling Xigmatek HDT S1283 (120mm)
Memory G.Skill 4GB (2x2GB) DDR2 1066 (PC2 8500)
Video Card(s) EVGA GTX260
Storage WD Caviar Black 1TB 7200rpm 32MB SATA
Display(s) LG W2600H-PF 25.5" (1920x1200)
Case Cooler Master CM690
Audio Device(s) Creative Labs X-Fi Xtreme Gamer
Power Supply Corsair 750TX
Software Windows Vista Ultimate 64bit
#11

ny_driver

New Member
Joined
Dec 28, 2006
Messages
777 (0.19/day)
Likes
28
Location
central new york
System Name Overclock_Machine
Processor DFI LP UT nF4 SLI-DR Expert
Motherboard Opteron 146(3746MHz)
Cooling A/C Chiller w/ mod-Apogee XT/EK-FC4890 Special Edition
Memory 2 x 512MB OCZ Gold VX PC4000
Video Card(s) HD4890-Sapphire OC Edition
Display(s) Acer G235H-23" LCD
Case no, thanks
Audio Device(s) integrated
Power Supply Corsair TX-850w
Software Tiny7/XP
Benchmark Scores 6.625Ghz 965BE - CPU-Z 25,607 points 3dmark06 - 2 cards@952/1050
#12
hmmm..thanks:eek: the one I was going to get used is on the NOT RECOMENDED list for some reason, and I don't see my current PSU (powmax) on the list. I thought that Ultra x-connect had good amperages:confused:

Oh well I will use that list and go buy a new one..hopefully pretty cheap ($50-80 )
 

Guttboy

New Member
Joined
Dec 26, 2006
Messages
291 (0.07/day)
Likes
1
Location
Colorado
System Name First Build 2009
Processor Intel E8400 (E0) 3.0GHz
Motherboard Gigabyte GA-EP45-UD3P
Cooling Xigmatek HDT S1283 (120mm)
Memory G.Skill 4GB (2x2GB) DDR2 1066 (PC2 8500)
Video Card(s) EVGA GTX260
Storage WD Caviar Black 1TB 7200rpm 32MB SATA
Display(s) LG W2600H-PF 25.5" (1920x1200)
Case Cooler Master CM690
Audio Device(s) Creative Labs X-Fi Xtreme Gamer
Power Supply Corsair 750TX
Software Windows Vista Ultimate 64bit
#13
NY....not sure how the list was come up with but it was posted here earlier. MY current PSU is tier 5 and I am pretty sure that is correct as my voltages fluctuate quite a bit.

I do know one thing...dont skimp on your PSU...I have had some computers with crappy PSU's and it is no fun not being able to do the things you want because there was a crappy PSU that you coulda spent $20 more on and had a much better one.
 

overcast

New Member
Joined
Jan 11, 2006
Messages
733 (0.17/day)
Likes
2
Processor AMD Opteron 165 @ 2.7ghz Stock Voltage
Motherboard ASUS A8N-SLI Premium
Cooling Stock Opteron
Memory OCZ PC4000 EB Platinum 2GB
Video Card(s) ATI X1900XTX
Storage 2 x Western Digital 74gb Raptors
Display(s) NEC 990B 19"
Case Antec P150
Audio Device(s) Onboard
Power Supply Seasonic S12-500
Software XP 32bit
#14
Have you ever seen a 800 watt PSU single rail? Come on. I come back here and post after what, 2 months. Here comes those lessoning guys again.

Chow.
PC Power and Cooling has single rail power supplies from 310W to 750W

If you're going to go cheap on anything, DO NOT MAKE IT BE THE POWER SUPPLY.
 

ny_driver

New Member
Joined
Dec 28, 2006
Messages
777 (0.19/day)
Likes
28
Location
central new york
System Name Overclock_Machine
Processor DFI LP UT nF4 SLI-DR Expert
Motherboard Opteron 146(3746MHz)
Cooling A/C Chiller w/ mod-Apogee XT/EK-FC4890 Special Edition
Memory 2 x 512MB OCZ Gold VX PC4000
Video Card(s) HD4890-Sapphire OC Edition
Display(s) Acer G235H-23" LCD
Case no, thanks
Audio Device(s) integrated
Power Supply Corsair TX-850w
Software Tiny7/XP
Benchmark Scores 6.625Ghz 965BE - CPU-Z 25,607 points 3dmark06 - 2 cards@952/1050
#15
I decided to buy an XCLIO greatpower 600w for $99.99, this one here........:toast:

http://www.newegg.com/Product/Product.asp?Item=N82E16817189007

Not that pretty but it looked like the best tier 2 PSU at new-egg for the price. It has modular cabling and a big 140 mm fan ( I like fans) :pimp: Mostly great reviews and I have always had good luck with the egg so far. Any thoughts on my decision?

Thanks all for the sound advice:respect:
 

Guttboy

New Member
Joined
Dec 26, 2006
Messages
291 (0.07/day)
Likes
1
Location
Colorado
System Name First Build 2009
Processor Intel E8400 (E0) 3.0GHz
Motherboard Gigabyte GA-EP45-UD3P
Cooling Xigmatek HDT S1283 (120mm)
Memory G.Skill 4GB (2x2GB) DDR2 1066 (PC2 8500)
Video Card(s) EVGA GTX260
Storage WD Caviar Black 1TB 7200rpm 32MB SATA
Display(s) LG W2600H-PF 25.5" (1920x1200)
Case Cooler Master CM690
Audio Device(s) Creative Labs X-Fi Xtreme Gamer
Power Supply Corsair 750TX
Software Windows Vista Ultimate 64bit
#16
I have no experience with them but the reviews are pretty good. I guess the manual leaves something to be desired but the reviews in the "egg" are pretty comprehensive.
 

_33

New Member
Joined
Mar 25, 2006
Messages
1,248 (0.29/day)
Likes
31
Location
Quebec
System Name BEAST
Processor Intel Core i7 920 C0 Quad Core Processor LGA1366 2.66GHZ Bloomfield 8MB LGA batch 3844A509
Motherboard ASUS P6T Deluxe V2 X58 ATX LGA1366 DDR3
Cooling CoolIt ECO A.L.C. 120mm radiator
Memory G.SKILL F3-12800CL8TU-6GBPI PC3-12800 6GB 3X2GB DDR3-1600 CL8-8-8-21
Video Card(s) Sapphire Radeon HD 4890 1GB 850MHZ 1GB 3.9GHZ GDDR5 PCI-E 2XDVI HDTV
Storage SAMSUNG SPINPOINT F1 750GB X 2, WD2500KS 250GB, WD15EARS 1.5TB, WD20EARS 2.0TB
Display(s) LG W2361V-PF Monitors 23” Widescreen LCD Monitor (23.0” diagonal)
Case Cooler Master CM 690 II Advanced
Power Supply Thermaltake Toughpower 600W Power Supply ATX V2.2 20/24PIN EPS12V Qfan 140MM Fan Active PFC
Software Windows 7 Pro 64bit
#17
?
it has been said and proved that a single rail with a high A is better than multiple rails with lower A ;)
Well, the market doesn't seem to bide by your rules. Maybe post a link to support your theory.
 

pt

not a suicide-bomber
Joined
Mar 11, 2006
Messages
8,956 (2.09/day)
Likes
167
Location
Portugal
Processor AMD Turion 64 X2 Mobile TL-60 (Trinidad)
Motherboard ASUS F3Ka (ATI RS690M)
Cooling stock
Memory Nanya 2x1GB ddr2 667@5-5-5-15-2T
Video Card(s) ATI Mobility Radeon HD2600 512MB DDR2@ 580mhz/486mhz
Storage 160GB on laptop+250GB external
Display(s) ASUS 15.4
Case Asus Laptop F3Ka chassis
Audio Device(s) on-board
Power Supply 1:30minutes battery
Software "genui xp", 'cause i hated vista
#18
Well, the market doesn't seem to bide by your rules. Maybe post a link to support your theory.
it has been posted here on tpu i don't know where
the market is most of the times wrong
 

_33

New Member
Joined
Mar 25, 2006
Messages
1,248 (0.29/day)
Likes
31
Location
Quebec
System Name BEAST
Processor Intel Core i7 920 C0 Quad Core Processor LGA1366 2.66GHZ Bloomfield 8MB LGA batch 3844A509
Motherboard ASUS P6T Deluxe V2 X58 ATX LGA1366 DDR3
Cooling CoolIt ECO A.L.C. 120mm radiator
Memory G.SKILL F3-12800CL8TU-6GBPI PC3-12800 6GB 3X2GB DDR3-1600 CL8-8-8-21
Video Card(s) Sapphire Radeon HD 4890 1GB 850MHZ 1GB 3.9GHZ GDDR5 PCI-E 2XDVI HDTV
Storage SAMSUNG SPINPOINT F1 750GB X 2, WD2500KS 250GB, WD15EARS 1.5TB, WD20EARS 2.0TB
Display(s) LG W2361V-PF Monitors 23” Widescreen LCD Monitor (23.0” diagonal)
Case Cooler Master CM 690 II Advanced
Power Supply Thermaltake Toughpower 600W Power Supply ATX V2.2 20/24PIN EPS12V Qfan 140MM Fan Active PFC
Software Windows 7 Pro 64bit
#19
it has been posted here on tpu i don't know where
the market is most of the times wrong
I don't mind. TPU doesn't direct the market, they just spread the word. Right now the market is going towards multi 12v lines. Mine has 4, for 600w. And I have noticed much increased stability on the 12v compared to my previous PSU. Silverstone, which makes the best PSUs around do have multiple 12v lines on most of their flagship products: Element, Zeus & Strider series. Only the Olympia series has a single 12v line (wich might support part of your beliefs).
 

pt

not a suicide-bomber
Joined
Mar 11, 2006
Messages
8,956 (2.09/day)
Likes
167
Location
Portugal
Processor AMD Turion 64 X2 Mobile TL-60 (Trinidad)
Motherboard ASUS F3Ka (ATI RS690M)
Cooling stock
Memory Nanya 2x1GB ddr2 667@5-5-5-15-2T
Video Card(s) ATI Mobility Radeon HD2600 512MB DDR2@ 580mhz/486mhz
Storage 160GB on laptop+250GB external
Display(s) ASUS 15.4
Case Asus Laptop F3Ka chassis
Audio Device(s) on-board
Power Supply 1:30minutes battery
Software "genui xp", 'cause i hated vista
#20
I don't mind. TPU doesn't direct the market, they just spread the word. Right now the market is going towards multi 12v lines. Mine has 4, for 600w. And I have noticed much increased stability on the 12v compared to my previous PSU. Silverstone, which makes the best PSUs around do have multiple 12v lines on most of their flagship products: Element, Zeus & Strider series. Only the Olympia series has a single 12v line (wich might support part of your beliefs).
the market is also going towards multiple cores, and still most ppl won't use more than one ;)
 

Guttboy

New Member
Joined
Dec 26, 2006
Messages
291 (0.07/day)
Likes
1
Location
Colorado
System Name First Build 2009
Processor Intel E8400 (E0) 3.0GHz
Motherboard Gigabyte GA-EP45-UD3P
Cooling Xigmatek HDT S1283 (120mm)
Memory G.Skill 4GB (2x2GB) DDR2 1066 (PC2 8500)
Video Card(s) EVGA GTX260
Storage WD Caviar Black 1TB 7200rpm 32MB SATA
Display(s) LG W2600H-PF 25.5" (1920x1200)
Case Cooler Master CM690
Audio Device(s) Creative Labs X-Fi Xtreme Gamer
Power Supply Corsair 750TX
Software Windows Vista Ultimate 64bit
#21
This was taken from PC Power & Cooling and if you look in other spots you can find the same info by using Google......

"8. ARE MULTIPLE 12-VOLT RAILS BETTER THAN A SINGLE 12-VOLT RAIL?
With all the hype about multiple 12-volt rails (ads claim that two rails is better than one, five is better than four, etc.), you’d think it was a better design. Unfortunately, it’s not!

Here are the facts: A large, single 12-volt rail (without a 240VA limit) can transfer 100% of the 12-volt output from the PSU to the computer, while a multi-rail 12-volt design has distribution losses of up to 30% of the power supply’s rating. Those losses occur because power literally gets “trapped” on under-utilized rails. For example, if the 12-volt rail that powers the CPU is rated for 17 amps and the CPU only uses 7A, the remaining 10A is unusable, since it is isolated from the rest of the system.

Since the maximum current from any one 12-volt rail of a multiple-rail PSU is limited to 20 amps (240VA / 12 volts = 20 amps), PCs with high-performance components that draw over 20 amps from the same rail are subject to over-current shutdowns. With power requirements for multiple processors and graphics cards continuing to grow, the multiple-rail design, with its 240VA limit per rail, is basically obsolete.

PC Power and Cooling is once again leading the industry. All of our power supplies now feature a large, single 12-volt rail. The design is favored by major processor and graphics companies, complies with EPS12V specs (the 240VA limit is not a requirement) and is approved by all major safety agencies such as UL and TUV."

Taken from this website.....

http://www.pcpower.com/technology/myths/

Regards!
 

ny_driver

New Member
Joined
Dec 28, 2006
Messages
777 (0.19/day)
Likes
28
Location
central new york
System Name Overclock_Machine
Processor DFI LP UT nF4 SLI-DR Expert
Motherboard Opteron 146(3746MHz)
Cooling A/C Chiller w/ mod-Apogee XT/EK-FC4890 Special Edition
Memory 2 x 512MB OCZ Gold VX PC4000
Video Card(s) HD4890-Sapphire OC Edition
Display(s) Acer G235H-23" LCD
Case no, thanks
Audio Device(s) integrated
Power Supply Corsair TX-850w
Software Tiny7/XP
Benchmark Scores 6.625Ghz 965BE - CPU-Z 25,607 points 3dmark06 - 2 cards@952/1050
#22

_33

New Member
Joined
Mar 25, 2006
Messages
1,248 (0.29/day)
Likes
31
Location
Quebec
System Name BEAST
Processor Intel Core i7 920 C0 Quad Core Processor LGA1366 2.66GHZ Bloomfield 8MB LGA batch 3844A509
Motherboard ASUS P6T Deluxe V2 X58 ATX LGA1366 DDR3
Cooling CoolIt ECO A.L.C. 120mm radiator
Memory G.SKILL F3-12800CL8TU-6GBPI PC3-12800 6GB 3X2GB DDR3-1600 CL8-8-8-21
Video Card(s) Sapphire Radeon HD 4890 1GB 850MHZ 1GB 3.9GHZ GDDR5 PCI-E 2XDVI HDTV
Storage SAMSUNG SPINPOINT F1 750GB X 2, WD2500KS 250GB, WD15EARS 1.5TB, WD20EARS 2.0TB
Display(s) LG W2361V-PF Monitors 23” Widescreen LCD Monitor (23.0” diagonal)
Case Cooler Master CM 690 II Advanced
Power Supply Thermaltake Toughpower 600W Power Supply ATX V2.2 20/24PIN EPS12V Qfan 140MM Fan Active PFC
Software Windows 7 Pro 64bit
#23
This was taken from PC Power & Cooling and if you look in other spots you can find the same info by using Google......

"8. ARE MULTIPLE 12-VOLT RAILS BETTER THAN A SINGLE 12-VOLT RAIL?
With all the hype about multiple 12-volt rails (ads claim that two rails is better than one, five is better than four, etc.), you’d think it was a better design. Unfortunately, it’s not!

Here are the facts: A large, single 12-volt rail (without a 240VA limit) can transfer 100% of the 12-volt output from the PSU to the computer, while a multi-rail 12-volt design has distribution losses of up to 30% of the power supply’s rating. Those losses occur because power literally gets “trapped” on under-utilized rails. For example, if the 12-volt rail that powers the CPU is rated for 17 amps and the CPU only uses 7A, the remaining 10A is unusable, since it is isolated from the rest of the system.

Since the maximum current from any one 12-volt rail of a multiple-rail PSU is limited to 20 amps (240VA / 12 volts = 20 amps), PCs with high-performance components that draw over 20 amps from the same rail are subject to over-current shutdowns. With power requirements for multiple processors and graphics cards continuing to grow, the multiple-rail design, with its 240VA limit per rail, is basically obsolete.

PC Power and Cooling is once again leading the industry. All of our power supplies now feature a large, single 12-volt rail. The design is favored by major processor and graphics companies, complies with EPS12V specs (the 240VA limit is not a requirement) and is approved by all major safety agencies such as UL and TUV."

Taken from this website.....

http://www.pcpower.com/technology/myths/

Regards!
And here is my cross argument link

Everyone is going multi 12v rail, and that is a fact. Even if you see constraints in this, that is where the market is going, future proof or not. Now saying a 4x 12v rail PSU consumes more is ridiculous, as the PSU will consume as much as there are things plugged on it. Yet, it is true that you will need stronger multirail PSU than a single rail psu (my belief), sin on a multi-rail you will have some lost power potential on those multiple 12v rails. But some designs do make twin dual 12v rails, which in essence distributes each internal 12v in 2 x 12v rails that have a peak amperage each, so no big loss in amperage on that design. Yet each 12v rail should have a max amp draw of 20A as a guideline (most PSU manufacturers use 18A max, as it gives a margin for peaks up to 20A).

READ THIS QUESTION CAREFULLY:
Thought: The small ATX pins use in the 4, 6, 8, 20 and 24 pin shells are rated by Molex for 9A continous.
Now I've only seen pics of melted shells. Question to self. Will I see more in the near future with the use of high output single rail PSUs?
A decent tech setting up or maintaining equipment is one thing, a wide-eyed youngster playing with gaming hardware is another.
EDIT: Also, to add to the tought, imagine you trick the wiring from a 4 pin molex to plug your own fans, and stuff, but the wiring flashes and it shorts your 12v single rail. WHat do you think will happen to your GFX card, your CPU and all the other stuff plugged on that single rail?
 
Last edited:

ghost101

New Member
Joined
Jun 3, 2006
Messages
1,328 (0.32/day)
Likes
164
Location
London
#24
x-bit labs said:
Dual +12V output circuits

In good old times PC power supplies used to have one power rail for each of the output voltages (+5V, +12V, +3.3V, and a couple of negative voltages), and the maximum output power on each of the rails was not higher than 150-200W. It’s only in some high-wattage server-oriented power supplies that the load on the +5V rail could be as high as 50A, i.e. 250W. This situation was changing as computers required ever more power and the distribution of power consumption among the different power rails was shifting towards +12V.

The ATX12V 1.3 standard recommends a max current of 18A for the +12V rail and this is where a problem occurred. It was about safety regulations rather than about increasing the current load further. According to the EN-60950 standard, the maximum output power on user-accessible connectors must not exceed 240VA. It is thought that higher output power may with a higher probability lead to various disasters like inflammation in case of a short circuit or hardware failure. Obviously, this output power is achieved on the +12V rail at a current of 20A while the PSU connectors are surely user-accessible.

So, when it became necessary to push the allowable current bar higher on the +12V rail, Intel Corporation, the developer of the ATX12V standard, decided to divide that power rail into multiple ones, with a current of 18A on each, the 2A difference being left as a small reserve. Purely out of safety considerations, there was no other reason for that solution. It means that the power supply does not necessarily have to have more than one +12V power rail. It is only required that an attempt to put a load higher than 18A on any of its 12V connectors would trigger off the overcurrent protection. That’s all. This simplest way to implement this is to install a few shunts into the PSU, each of which is responsible for a group of connectors. If there’s a current of over 18A on a shunt, the protection wakes up. As a result, the output power of none of the 12V connectors can exceed 18A*12V=216VA, but the combined power on the different 12V connectors can be higher than that number.

That’s why there are virtually no power supplies existing with two, three or four +12V power rails. Why should the engineer pack additional components into the already overcrowded PSU case when he can do with just a couple of shunts and a simple chip that will be controlling the voltage in them (the resistance of a shunt being a known value, the current passing through the shunt can be known if you know the voltage).

But the marketing folk just couldn’t pass by such an opportunity and now you can read on any PSU box that dual +12V output circuits help increase power and stability, the more so if there are not two but three such lines!

You think they stopped at that? Not at all. The latest trend is power supplies that have and don’t have the splitting of the +12V rail at the same time. How? It’s simple. If the current on any of the +12V output lines exceeds the 18A threshold, the overcurrent protection becomes disabled. As a result, they can still embellish the box with the magical text, “Triple 12V Rails for Unprecedented Power and Stability”, but can also add there some nonsense that the three rails are united into one when necessary. I call this nonsense because, as I have written above, there have never been separate +12V power rails. It’s impossible to comprehend the depth of that “new technology” from a technical standpoint. In fact, they try to present the lack of one technology as another technology.
:)
 
Joined
Sep 20, 2006
Messages
1,998 (0.49/day)
Likes
0
Location
ashentech.com
Processor Athlon64 3500+(2.2gz)@2.94gz(3.03gz)
Motherboard Biostar Tforce550 (RMA) (m2n-sli delux)
Cooling PIB cooler
Memory 2gb ocz 533 +1gb samsung 533 4-4-4-12
Video Card(s) x1900xtx 512mb+zalman vf900 cooler(kicks stock coolers arse)
Storage 80gb,200gb,250gb,160gb
Display(s) 20.1 in dell 2001fp + KDS visual sensations 19"
Case Codegen briza seirse
Audio Device(s) ADI SoundMax HD audio onboard,using Ket's driver pack
Power Supply FSP 400watt SAGA seirse w/noise killer
Software Windows 2003 ent server as workstation(kills xp in perf and stab)
#25
click my siggy link, and fortron or epower are the best value for power and quility
you can find :)