• Welcome to TechPowerUp Forums, Guest! Please check out our forum guidelines for info related to our community.

Buying a 2nd GTX280 today

Joined
Feb 21, 2008
Messages
6,309 (1.74/day)
Likes
3,428
Location
S.E. Virginia
System Name Barb's Domain/Barb's Cruncher#2
Processor i7 3930k@3.8ghz/i7 860 @ 3.3ghz
Motherboard ASUS Rampage IV Black Edition/Gigabyte P55-UD3R
Cooling Deep Cool Assassin/Corsair A50
Memory 16gig DDR3 1600/4gig DDR3 1600
Video Card(s) GTX 1070 OC'ed 2.1GHz core/4GHz mem/MSI HD7770
Storage 500GB WD Blue SSD, 2TB Seagate Hybrid SSHD/ WD Caviar Blue 160gb
Display(s) HP ZR30W 30" 2560*1600/SOYO Topaz S 24" 1920*1200
Case SilverStone Fortress FT04/NZXT Source 210 Black
Audio Device(s) Logitech Z533
Power Supply XFX 750W XXX edition/PC Power Cooling Turbo Cool 860
Mouse Logitect G5
Software Windows 10 Pro 64 bit /Windows 7 Ult 64 bit
Benchmark Scores https://www.3dmark.com/fs/14508101
#1
I'm sending off the money today to buy that GTX280 from trt740, and I'm wondering if my power supply will be plenty. If I had a corsair, seasonic, PC power and cooling, enermax or one of the other TOP OF THE LINE PSUs, I wouldn't be worried, but that isn't the case here. Is my cooler master real power pro enough to run the system in my specs with a 2nd GTX280 in SLI??

Here's the product page for the PSU I have- http://www.coolermaster.com/product.php?product_id=2552
 
Joined
Feb 21, 2008
Messages
6,309 (1.74/day)
Likes
3,428
Location
S.E. Virginia
System Name Barb's Domain/Barb's Cruncher#2
Processor i7 3930k@3.8ghz/i7 860 @ 3.3ghz
Motherboard ASUS Rampage IV Black Edition/Gigabyte P55-UD3R
Cooling Deep Cool Assassin/Corsair A50
Memory 16gig DDR3 1600/4gig DDR3 1600
Video Card(s) GTX 1070 OC'ed 2.1GHz core/4GHz mem/MSI HD7770
Storage 500GB WD Blue SSD, 2TB Seagate Hybrid SSHD/ WD Caviar Blue 160gb
Display(s) HP ZR30W 30" 2560*1600/SOYO Topaz S 24" 1920*1200
Case SilverStone Fortress FT04/NZXT Source 210 Black
Audio Device(s) Logitech Z533
Power Supply XFX 750W XXX edition/PC Power Cooling Turbo Cool 860
Mouse Logitect G5
Software Windows 10 Pro 64 bit /Windows 7 Ult 64 bit
Benchmark Scores https://www.3dmark.com/fs/14508101
#2
I would really appreciate some opinions. Last thing I want to do or can afford to do is fry my computer because my PSU can't handle the two GTX280's. I've found a 1k turbo cool PC power and cooling PSU for $115, do I need to buy that or not?
 

DaMulta

My stars went supernova
Joined
Aug 3, 2006
Messages
16,162 (3.86/day)
Likes
1,419
Location
Oklahoma T-Town
System Name Work in progress
Processor AMD 955---4Ghz
Motherboard MSi GD70
Cooling OcZ Phase/water
Memory Crucial2GB kit (1GBx2), Ballistix 240-pin DIMM, DDR3 PC3-16000
Video Card(s) CrossfireX 2 X HD 4890 1GB OCed to 1000Mhz
Storage SSD 64GB
Display(s) Envision 24'' 1920x1200
Case Using the desk ATM
Audio Device(s) Sucky onboard for now :(
Power Supply 1000W TruePower Quattro
#3
I bet you will be in the ok.
 

Tatty_One

Super Moderator
Staff member
Joined
Jan 18, 2006
Messages
19,834 (4.52/day)
Likes
6,125
Location
Worcestershire, UK
Processor Skylake Core i7 6700k @ 4.6gig
Motherboard MSI Z170A Tomahawk
Cooling Cooler Master Seidon 240V AIO/Viper140's
Memory 16GB Corsair Vengeance LPX 3000mhz CL14
Video Card(s) Sapphire 4gb R9 290X VaporX @1150mhz
Storage SkHynix SL308 120GB/CrucialM4/1TB WD Black
Display(s) LG 29inch 2560x1080 Curved Ultrawide IPS
Case Phanteks Enthoo Pro M Windowed - Gunmetal
Audio Device(s) Xifi Elite Pro 7.1/VideoLogic ZXR550's
Power Supply XFX Pro Black Edition 750W Gold modular
Keyboard CM Storm Octane Combo
Software Win 10 Home x64
#4
Joined
Feb 21, 2008
Messages
6,309 (1.74/day)
Likes
3,428
Location
S.E. Virginia
System Name Barb's Domain/Barb's Cruncher#2
Processor i7 3930k@3.8ghz/i7 860 @ 3.3ghz
Motherboard ASUS Rampage IV Black Edition/Gigabyte P55-UD3R
Cooling Deep Cool Assassin/Corsair A50
Memory 16gig DDR3 1600/4gig DDR3 1600
Video Card(s) GTX 1070 OC'ed 2.1GHz core/4GHz mem/MSI HD7770
Storage 500GB WD Blue SSD, 2TB Seagate Hybrid SSHD/ WD Caviar Blue 160gb
Display(s) HP ZR30W 30" 2560*1600/SOYO Topaz S 24" 1920*1200
Case SilverStone Fortress FT04/NZXT Source 210 Black
Audio Device(s) Logitech Z533
Power Supply XFX 750W XXX edition/PC Power Cooling Turbo Cool 860
Mouse Logitect G5
Software Windows 10 Pro 64 bit /Windows 7 Ult 64 bit
Benchmark Scores https://www.3dmark.com/fs/14508101
#5
I hearing I'll either "be on the edge" or not able to run the 280's with my current PSU. I just sent a PM to the person with the $115 turbo cool 1k watt PSU. Thanks
 

Tatty_One

Super Moderator
Staff member
Joined
Jan 18, 2006
Messages
19,834 (4.52/day)
Likes
6,125
Location
Worcestershire, UK
Processor Skylake Core i7 6700k @ 4.6gig
Motherboard MSI Z170A Tomahawk
Cooling Cooler Master Seidon 240V AIO/Viper140's
Memory 16GB Corsair Vengeance LPX 3000mhz CL14
Video Card(s) Sapphire 4gb R9 290X VaporX @1150mhz
Storage SkHynix SL308 120GB/CrucialM4/1TB WD Black
Display(s) LG 29inch 2560x1080 Curved Ultrawide IPS
Case Phanteks Enthoo Pro M Windowed - Gunmetal
Audio Device(s) Xifi Elite Pro 7.1/VideoLogic ZXR550's
Power Supply XFX Pro Black Edition 750W Gold modular
Keyboard CM Storm Octane Combo
Software Win 10 Home x64
#6
Joined
Aug 25, 2008
Messages
402 (0.12/day)
Likes
92
Location
Bydgoszcz, Poland
System Name "Złotko"
Processor AMD 1055T @ 3600 MHz
Motherboard Asrock 880G@890GX
Cooling Thermalright 120 Xtreme (lapped)
Memory A-Data 1600 Plus
Video Card(s) Asus HD6950 unlocked - WOW
Storage many more than you can imagine
Display(s) Acer AL1923 and Philips 40PFL5605H
Case Fractal Define R3
Audio Device(s) X-Fi Music / onboard
Power Supply Seasonic M12D 850W
Software viruses, worms, trojan horses, spyware, adware, rootkits
Benchmark Scores 2.3 promile of alcohol in my blood and still standing
#7
Sell your GTX280 and go for HD5870. You would get:
- less power usage
- a lot more rendering power than 2xGTX280
- most sexy card on market
- I think cost of two GTX280 is more than a one HD5870. Isn't it?
 

1Kurgan1

The Knife in your Back
Joined
Dec 8, 2008
Messages
10,418 (3.13/day)
Likes
2,391
Location
Duluth, Minnesota
System Name My Comp | Fiancees Comp
Processor i7 5820k @ 4.6Ghz 1.285v| i5 2500k
Motherboard MSI x99 SLI Plus | AsRock Z77 Pro 3
Cooling Watercooled
Memory 16GB DDR4 2400 @ 2666 | 12GB DDR3 1600
Video Card(s) AMD R9 290x | MSI 5850 OC
Storage 128gb SSD + 2x 2TB | 2TB
Display(s) Asus 27" LCD | 25" Hanns G
Case CM Storm | CM Elite 430
Audio Device(s) Creative Recon 3D PCIe
Power Supply Enermax Galaxy 1250W | Rosewill 630w
Mouse Logitech G700s | Logitech G100s
Keyboard Logitech G901 | Logitech G105
Software Win 8.1 Ultimate x64 | Win 8.1 Ultimate x64
Benchmark Scores 3D Mark - Fire Strike Extreme - 4403
#8
Actually a 5870 will not be more powerful than 2x 280's. It will be more consistent since their won't be multiple GPU's. But a 5870 is a bit behind a GTX 295 and thats basically 2x 260's, and the 280 is quiet a bit faster than a 260.
 
Joined
Apr 30, 2008
Messages
4,315 (1.21/day)
Likes
1,015
Location
Multidimensional
System Name Derp!
Processor i7 7700 @ 4.2Ghz Turbo On
Motherboard Gigabyte B250 Phoenix Wifi ITX Motherboard
Cooling Noctua NH-L9i LP Cooler || Cooler Master Fan Pro RGB 120mm x 2
Memory 16GB Corsair Vengeance LPX DDR4 2400mhz RAM
Video Card(s) AMD Reference RX 480 8GB
Storage 250GB SS 960 Evo M.2 || WD Blue 500GB SSD || 2TB SG FC SSHD
Display(s) Hisense 1080p Smart LED HDTV 40inch
Case Fractal Node 202 Mini ITX Case
Audio Device(s) Realtek HD Audio / HDMI Audio Via GPU
Power Supply Corsair SFX 600W PSU
Mouse CoolerMaster Masterkeys Lite L RGB Mouse
Keyboard CoolerMaster Masterkeys Lite L RGB Mem-Chanical Keyboard
Software Windows 10 Home 64bit
Benchmark Scores Later
#9
gtx 295 is actually 2 gtx 275 on one pcb.
 

1Kurgan1

The Knife in your Back
Joined
Dec 8, 2008
Messages
10,418 (3.13/day)
Likes
2,391
Location
Duluth, Minnesota
System Name My Comp | Fiancees Comp
Processor i7 5820k @ 4.6Ghz 1.285v| i5 2500k
Motherboard MSI x99 SLI Plus | AsRock Z77 Pro 3
Cooling Watercooled
Memory 16GB DDR4 2400 @ 2666 | 12GB DDR3 1600
Video Card(s) AMD R9 290x | MSI 5850 OC
Storage 128gb SSD + 2x 2TB | 2TB
Display(s) Asus 27" LCD | 25" Hanns G
Case CM Storm | CM Elite 430
Audio Device(s) Creative Recon 3D PCIe
Power Supply Enermax Galaxy 1250W | Rosewill 630w
Mouse Logitech G700s | Logitech G100s
Keyboard Logitech G901 | Logitech G105
Software Win 8.1 Ultimate x64 | Win 8.1 Ultimate x64
Benchmark Scores 3D Mark - Fire Strike Extreme - 4403
#10
gtx 295 is actually 2 gtx 275 on one pcb.
Ah, wasn't exactly sure which one it was, but the 275 uses the 260 pcb, but better GPU's correct?
 
Joined
Apr 30, 2008
Messages
4,315 (1.21/day)
Likes
1,015
Location
Multidimensional
System Name Derp!
Processor i7 7700 @ 4.2Ghz Turbo On
Motherboard Gigabyte B250 Phoenix Wifi ITX Motherboard
Cooling Noctua NH-L9i LP Cooler || Cooler Master Fan Pro RGB 120mm x 2
Memory 16GB Corsair Vengeance LPX DDR4 2400mhz RAM
Video Card(s) AMD Reference RX 480 8GB
Storage 250GB SS 960 Evo M.2 || WD Blue 500GB SSD || 2TB SG FC SSHD
Display(s) Hisense 1080p Smart LED HDTV 40inch
Case Fractal Node 202 Mini ITX Case
Audio Device(s) Realtek HD Audio / HDMI Audio Via GPU
Power Supply Corsair SFX 600W PSU
Mouse CoolerMaster Masterkeys Lite L RGB Mouse
Keyboard CoolerMaster Masterkeys Lite L RGB Mem-Chanical Keyboard
Software Windows 10 Home 64bit
Benchmark Scores Later
#11
have you already bought the 2nd gtx280, like arroyo said, i would have done his idea.
 

bogmali

Moderator
Staff member
Joined
Mar 16, 2008
Messages
7,464 (2.07/day)
Likes
4,789
Location
Pacific Northwest
System Name System Has No Name
Processor Core i7-7820X
Motherboard MSI X299 Gaming Pro Carbon
Cooling Corsair H115i AIO
Memory Apacer Blade 4x8GB DDR4-3200
Video Card(s) Gigabyte AORUS GTX-1080ti
Storage Sandisk SDSSDXP 240GB SSD, Sandisk Extreme Pro 480GB SSD, Samsung 960 Pro M.2 NVMe 1TB
Display(s) Samsung UE510 UHD 28"
Case Coolermaster MasterCase H500P
Audio Device(s) Onboard
Power Supply Seasonic Prime Ultra 1K Watt
Mouse EpicGear Zora
Keyboard CM Quickfire Xti
Software Win10 Pro 64
Benchmark Scores Xbox Live Gamertag=jondonken
#12
Contrary to what everyone has said so far..........I am running 2X GTX280 in my UD5 powered by the same exact PSU and they're both folding......Now the only thing that I'm not sure about is the SLI part (if it does draw more power from the PSU when they're linked). I also know for a fact that Mikeo47 ran 3 GTX260's on a 650W PSU so I would say yes;)
 
Joined
Nov 4, 2007
Messages
367 (0.10/day)
Likes
58
Location
Europe -> Poland...
System Name Notebook HP EliteBook 8460p
Processor Intel i5 2410
Memory 4GB DDR3
Video Card(s) Intel HD Graphics 3000
Storage Some 250GB 7200rpm HDD
Display(s) LG W2452V-PF 24" lcd
Software Ubuntu 11.11 | Win 7 Professional
#13
Well, IMO you should be perfectly OK with your current PSU.
Just check the review of ASUS MARS here, on TPU, especially the 'Power Consumption' page:



As you know - Asus Mars IS the dual GTX 285. And if GTX 280 uses let's say... 20W less power, than you can add 40W to the result above and we are still under the 500W. And while I know, that CoolerMaster isn't a BeQuiet, Corsair or ENERMAX, still I'm quite convinced that it's not Codegen either :)D) and Real Power 750W should suit your needs perfectly well.

PS. While I'd also go for the '5870' option i still wish you loads of fun and enjoyment with your GTX 280 SLI setup. 8)
 
Joined
Feb 21, 2008
Messages
6,309 (1.74/day)
Likes
3,428
Location
S.E. Virginia
System Name Barb's Domain/Barb's Cruncher#2
Processor i7 3930k@3.8ghz/i7 860 @ 3.3ghz
Motherboard ASUS Rampage IV Black Edition/Gigabyte P55-UD3R
Cooling Deep Cool Assassin/Corsair A50
Memory 16gig DDR3 1600/4gig DDR3 1600
Video Card(s) GTX 1070 OC'ed 2.1GHz core/4GHz mem/MSI HD7770
Storage 500GB WD Blue SSD, 2TB Seagate Hybrid SSHD/ WD Caviar Blue 160gb
Display(s) HP ZR30W 30" 2560*1600/SOYO Topaz S 24" 1920*1200
Case SilverStone Fortress FT04/NZXT Source 210 Black
Audio Device(s) Logitech Z533
Power Supply XFX 750W XXX edition/PC Power Cooling Turbo Cool 860
Mouse Logitect G5
Software Windows 10 Pro 64 bit /Windows 7 Ult 64 bit
Benchmark Scores https://www.3dmark.com/fs/14508101
#14
THX Bogmali, having to buy another PSU right now would really hurt my pocket. I do plan on getting a 1k PSU real soon (next paycheck).
 
Joined
Feb 21, 2008
Messages
6,309 (1.74/day)
Likes
3,428
Location
S.E. Virginia
System Name Barb's Domain/Barb's Cruncher#2
Processor i7 3930k@3.8ghz/i7 860 @ 3.3ghz
Motherboard ASUS Rampage IV Black Edition/Gigabyte P55-UD3R
Cooling Deep Cool Assassin/Corsair A50
Memory 16gig DDR3 1600/4gig DDR3 1600
Video Card(s) GTX 1070 OC'ed 2.1GHz core/4GHz mem/MSI HD7770
Storage 500GB WD Blue SSD, 2TB Seagate Hybrid SSHD/ WD Caviar Blue 160gb
Display(s) HP ZR30W 30" 2560*1600/SOYO Topaz S 24" 1920*1200
Case SilverStone Fortress FT04/NZXT Source 210 Black
Audio Device(s) Logitech Z533
Power Supply XFX 750W XXX edition/PC Power Cooling Turbo Cool 860
Mouse Logitect G5
Software Windows 10 Pro 64 bit /Windows 7 Ult 64 bit
Benchmark Scores https://www.3dmark.com/fs/14508101
#15
Sell your GTX280 and go for HD5870. You would get:
- less power usage
- a lot more rendering power than 2xGTX280
- most sexy card on market
- I think cost of two GTX280 is more than a one HD5870. Isn't it?

not really worried about power usage, my power bill is really low(under $75 a month)

2 GTX280 are more powerful than the 5870

matter of opinion on "sexest card on the market", personally I think the ASUS MARS GTX285 is the sexest card on the market.

I already own one GTX280 and I'm getting the 2nd for about $180. Yeah, I could sell the 280's, buy a 5870, and possibly break even, and I might eventually. But for now, I'm gonna enjoy SLI.
 

1Kurgan1

The Knife in your Back
Joined
Dec 8, 2008
Messages
10,418 (3.13/day)
Likes
2,391
Location
Duluth, Minnesota
System Name My Comp | Fiancees Comp
Processor i7 5820k @ 4.6Ghz 1.285v| i5 2500k
Motherboard MSI x99 SLI Plus | AsRock Z77 Pro 3
Cooling Watercooled
Memory 16GB DDR4 2400 @ 2666 | 12GB DDR3 1600
Video Card(s) AMD R9 290x | MSI 5850 OC
Storage 128gb SSD + 2x 2TB | 2TB
Display(s) Asus 27" LCD | 25" Hanns G
Case CM Storm | CM Elite 430
Audio Device(s) Creative Recon 3D PCIe
Power Supply Enermax Galaxy 1250W | Rosewill 630w
Mouse Logitech G700s | Logitech G100s
Keyboard Logitech G901 | Logitech G105
Software Win 8.1 Ultimate x64 | Win 8.1 Ultimate x64
Benchmark Scores 3D Mark - Fire Strike Extreme - 4403
#16
Remember, you also have an OC'd CPU and chipset to feed, a few other things like HDD's, but those don't require much power. I still think you will be in the clear, but not by too much.
 
Joined
Feb 21, 2008
Messages
6,309 (1.74/day)
Likes
3,428
Location
S.E. Virginia
System Name Barb's Domain/Barb's Cruncher#2
Processor i7 3930k@3.8ghz/i7 860 @ 3.3ghz
Motherboard ASUS Rampage IV Black Edition/Gigabyte P55-UD3R
Cooling Deep Cool Assassin/Corsair A50
Memory 16gig DDR3 1600/4gig DDR3 1600
Video Card(s) GTX 1070 OC'ed 2.1GHz core/4GHz mem/MSI HD7770
Storage 500GB WD Blue SSD, 2TB Seagate Hybrid SSHD/ WD Caviar Blue 160gb
Display(s) HP ZR30W 30" 2560*1600/SOYO Topaz S 24" 1920*1200
Case SilverStone Fortress FT04/NZXT Source 210 Black
Audio Device(s) Logitech Z533
Power Supply XFX 750W XXX edition/PC Power Cooling Turbo Cool 860
Mouse Logitect G5
Software Windows 10 Pro 64 bit /Windows 7 Ult 64 bit
Benchmark Scores https://www.3dmark.com/fs/14508101
#17
I still think you will be in the clear, but not by too much.
Which is why while my current PSU might be enough, I'm still looking to upgrade my PSU, just not right this minute(unless I find a really killer deal and force myself to afford it)
 

Tatty_One

Super Moderator
Staff member
Joined
Jan 18, 2006
Messages
19,834 (4.52/day)
Likes
6,125
Location
Worcestershire, UK
Processor Skylake Core i7 6700k @ 4.6gig
Motherboard MSI Z170A Tomahawk
Cooling Cooler Master Seidon 240V AIO/Viper140's
Memory 16GB Corsair Vengeance LPX 3000mhz CL14
Video Card(s) Sapphire 4gb R9 290X VaporX @1150mhz
Storage SkHynix SL308 120GB/CrucialM4/1TB WD Black
Display(s) LG 29inch 2560x1080 Curved Ultrawide IPS
Case Phanteks Enthoo Pro M Windowed - Gunmetal
Audio Device(s) Xifi Elite Pro 7.1/VideoLogic ZXR550's
Power Supply XFX Pro Black Edition 750W Gold modular
Keyboard CM Storm Octane Combo
Software Win 10 Home x64
#18
Well as I understand it, the TPU reviews are card power draw not system power draw so the equation is pretty simple, baring in mind that as mentioned, the Asus Mars will draw only slightly less power as it has the extra memory but its fairly safe to say that the 280 SLi setup may come in about 470W at full load (NO OVERCLOCKING), now add to that the fact that you have a quadcore CPU which at load WITHOUT overclocking will hit upto 135W TDP so lets call that 505W add to that all the other bits and bobs in your system and you are realistically talking probably 610W with no overclocking, OK, lets do some math......

750W @ 80% efficiency rating equals continuous @ 600W

Now remember, as i said thats at stock, now I may have added a little too much wattage in your peripherals but you need a safety margin and IMO you just dont have one.

I dont doubt what some are saying that they know people running two 280's with the same or less but my point is, in the longer term they are pushing the PSU to it's max peak output which will result in the big bang or just plain old failure, all i can say is personally..... I wouldnt take that risk however if funds are the issue..... you may have little choice, whatever you decide just be careful!
 
Joined
May 13, 2009
Messages
176 (0.06/day)
Likes
25
Processor Core i7 @ 3.5GHz stock voltage
Motherboard MSI Eclipse
Cooling Noctua NH-12P SE
Memory 6 GB 1066MHz
Video Card(s) 2x GTX260 @ 701/1506
Storage Raptor 74 GB
Display(s) NEC MultiSync 2080UX+
Power Supply Corsair HX620
Software Win7
#19
Is my cooler master real power pro enough to run the system in my specs with a 2nd GTX280 in SLI??

Here's the product page for the PSU I have- http://www.coolermaster.com/product.php?product_id=2552
Yes.
People need to understand that most wattage is quoted at the wall(AC) which is understandable considering how cheap Kill-a-watt is. Power supplies are rated for DC Power. The difference is efficiency. Your 750W(DC) will hypothetically draw 937W(AC) at the wall if it was loaded fully and if it had 80% efficiency(common 80Plus PSU). Of course its not recommended to run it 24/7 at full capacity, so factor in 80% of max power rating as a good limit. So your system has to draw no more than 600W DC so you have 150 W slack.
My GTX260 SLI, overclocked, running 2 GPU clients folding and 2 VM of 4 cores each so Hyperthreading uses its 30W(AC) and my system barely goes to 560W(AC), which is around 448W(DC) on my Corsair HX620 and around 72% of max power rating. Again this is 100% load on everything. Games barely load the cards compared to folding@home or furmark.
It really depends on your usage, but if the components in you PSU are not up to par, it will probably have a shorter life.
 
Last edited:
Joined
Nov 4, 2007
Messages
367 (0.10/day)
Likes
58
Location
Europe -> Poland...
System Name Notebook HP EliteBook 8460p
Processor Intel i5 2410
Memory 4GB DDR3
Video Card(s) Intel HD Graphics 3000
Storage Some 250GB 7200rpm HDD
Display(s) LG W2452V-PF 24" lcd
Software Ubuntu 11.11 | Win 7 Professional
#20
Nicely said, extrasalty.

And just for the record, this is the power usage of quite power-hungry PC from the Guru3D's Gigabyte Odin PSU review:

Code:
nForce 790i motherboard (has high power consumption) 
Core 2 Quad QX 9770 Processor (overclocked to 3.6 GHz) 
[B]2x GeForce GTX 295 primary (4 GPUs) [/B]
3 GB Memory DDR3 @ 1600 MHz 
Optical Drive x1 
HDD x1


IMO you are quite safe with 2 GPUs on CM 750W PSU.


PS. I hope i'm not violating any forum rules by linking to other hardware site. If so - my apologies.
 
Joined
Feb 21, 2008
Messages
6,309 (1.74/day)
Likes
3,428
Location
S.E. Virginia
System Name Barb's Domain/Barb's Cruncher#2
Processor i7 3930k@3.8ghz/i7 860 @ 3.3ghz
Motherboard ASUS Rampage IV Black Edition/Gigabyte P55-UD3R
Cooling Deep Cool Assassin/Corsair A50
Memory 16gig DDR3 1600/4gig DDR3 1600
Video Card(s) GTX 1070 OC'ed 2.1GHz core/4GHz mem/MSI HD7770
Storage 500GB WD Blue SSD, 2TB Seagate Hybrid SSHD/ WD Caviar Blue 160gb
Display(s) HP ZR30W 30" 2560*1600/SOYO Topaz S 24" 1920*1200
Case SilverStone Fortress FT04/NZXT Source 210 Black
Audio Device(s) Logitech Z533
Power Supply XFX 750W XXX edition/PC Power Cooling Turbo Cool 860
Mouse Logitect G5
Software Windows 10 Pro 64 bit /Windows 7 Ult 64 bit
Benchmark Scores https://www.3dmark.com/fs/14508101
#21
Tatty, I 100% respect your knowledge and experience, and I am fully taking your advise. But also on the same count, I really can't afford a PSU upgrade til my next paycheck. Once I have the money, I will be buying a 1000 watt PSU, but until then, I'm gonna try running my CM 750. If I have one single issue, I'll pull the 2nd 280 until I get the new PSU(all it'll take is one crash). Also, I'll run my system at stock and try to under volt my CPU until I get the new PSU.
 

Tatty_One

Super Moderator
Staff member
Joined
Jan 18, 2006
Messages
19,834 (4.52/day)
Likes
6,125
Location
Worcestershire, UK
Processor Skylake Core i7 6700k @ 4.6gig
Motherboard MSI Z170A Tomahawk
Cooling Cooler Master Seidon 240V AIO/Viper140's
Memory 16GB Corsair Vengeance LPX 3000mhz CL14
Video Card(s) Sapphire 4gb R9 290X VaporX @1150mhz
Storage SkHynix SL308 120GB/CrucialM4/1TB WD Black
Display(s) LG 29inch 2560x1080 Curved Ultrawide IPS
Case Phanteks Enthoo Pro M Windowed - Gunmetal
Audio Device(s) Xifi Elite Pro 7.1/VideoLogic ZXR550's
Power Supply XFX Pro Black Edition 750W Gold modular
Keyboard CM Storm Octane Combo
Software Win 10 Home x64
#22
Tatty, I 100% respect your knowledge and experience, and I am fully taking your advise. But also on the same count, I really can't afford a PSU upgrade til my next paycheck. Once I have the money, I will be buying a 1000 watt PSU, but until then, I'm gonna try running my CM 750. If I have one single issue, I'll pull the 2nd 280 until I get the new PSU(all it'll take is one crash). Also, I'll run my system at stock and try to under volt my CPU until I get the new PSU.
I understand, as I said earlier, I am not disagreeing with anyone here, a 750W decent PSU will run them but again as I said, at full load overclocked in my opinion it is running "close to the wire" for long term use and personally I would not advise anyone to run close, anyone can quote reviews and sites, comparing 55nm GPU's with 65nm reviews is not completely accurate, I could tell you to pop over to VR Zone and look at their review of 280 in SLi with a quadcore at 3.6gig, a single HDD and a single optical and they were pulling 607W from the wall peak but that was with the GPU's at stock (I think), chances are you will be fine but at least if in the longer term it does go "BANG"..... I wont be the person you are pointing your finger at! :D

Despite what we all have said in any case, W1zz's review that you posted above shows that he managed to draw 249W from a single 280, so double it, add 135W for a quadcore see what you have left for your peripherals and other hardware and fans etc........ those results would suggest that not all reviews are the same shall we say and may indicate contrary to what some have said..... especially when you see that W1zz managed to pull 320W from a single 295, double that to 660W which is more than the whole system consumption based on 2 GTX295's that someone mentioned earlier.
 
Last edited:

JrRacinFan

Served 5k and counting ...
Joined
Mar 17, 2007
Messages
19,666 (4.96/day)
Likes
4,754
Location
Youngstown, OH
System Name Gamer :Server and Android BuildBox
Processor i7 3930k: Xeon e5-2660
Motherboard MSI X79A-GD45 Plus : Generic
Cooling Liqid cooled: CM 212+
Memory Klevv Neo 2x4Gb 1866 @ 1600 CL9 : 2x8Gb Vengeance 1600 cl9
Video Card(s) EVGA GTX 950 SC : XFX R5 220
Storage HGST 2TB + 480GB OCZ Trion 150 : Seagate 1TB SSHD + WD 3TB + 2x HGST 2TB
Display(s) ViewSonic VX2457-MHD 23.6" : headless
Case DIYPC D480-W White Window : Bitfenix Comrade
Audio Device(s) nVidia HDMI : Onboard
Power Supply EVGA 500b : Tt 775W Modular
Software Windows 7 Ultimate+Manjaro 16.06: Ubuntu Server 16.10
#23
Just read up on your OEM for that PSU, it could be a 70/30 respectively, Acbel or ChannelWell. Both have had bad pasts but are good OEMs.
 

newtekie1

Semi-Retired Folder
Joined
Nov 22, 2005
Messages
24,424 (5.49/day)
Likes
10,567
Location
Indiana, USA
Processor Intel Core i7 8700K@4.8GHz(Quick and dirty)
Motherboard AsRock Z370 Taichi
Cooling Corsair H110i GTX
Memory 32GB Corsair DDR4-3000
Video Card(s) PNY XLR8 GTX1060 6GB
Storage 480GB Crucial MX200 + 2TB Seagate Solid State Hybrid Drive with 128GB OCZ Synapse SSD Cache
Display(s) QNIX QX2710 1440p@120Hz
Case Fractal Design Define S
Audio Device(s) Onboard is good enough for me
Power Supply Corsair HX850
Software Windows 10 Pro x64
#24
750W @ 80% efficiency rating equals continuous @ 600W
I'm pretty sure that is not how power supplies and efficiency work.

The power supply is rated at 750w continuous DC power. The 80% efficiency means that the conversion from AC to DC is only 80% efficient(the rest goes to heat). So while the power supply is supplying 750w continuous DC power, it is drawing more AC from the wall. What the 80% efficiency tells us is: At full 750w load, the power supply will be sucking 935w from the wall.

The important thing to note about his power supply though, is that the +12v is only rated for 648w continuous.

Two GTX280s are going to peak about about 340w, based on W1z's review, the maximum they are going to pull during Furmark is !500w! but that will likely never occur in real world conditions, not even when folding.

I am in completely agreement that, once you add in everything else, there is no buffer so your next move should be a bigger power supply. And until you do get a new power supply, don't run Furmark:D.
 
Joined
Sep 29, 2004
Messages
897 (0.18/day)
Likes
180
Location
Palm Desert, CA
System Name The Shroomiest One!
Processor AMD Ryzen 7 1700
Motherboard ASRock x370 Taichi
Cooling BeQuiet Dark Rock TF
Memory 2x8gb Team Dark Pro 3200C14
Video Card(s) Gigabyte GTX970 Xtreme Gaming OC
Storage Samsung 960 Evo 500GB / 840 Pro 256GB / Western Digital 2Tb Black
Display(s) LG 42" HDTV LED 1080p
Case Corsair Carbide Series 400R Graphite Grey
Audio Device(s) SoundBlasterX AE-5
Power Supply EVGA 1000w Supernova
Mouse Razor Deathadder Elite
Keyboard Logitech G15
Software Windows 10 Home 64bit
#25
i calculated your spec with the psu calcuator and it says you should be alright

check it out here
http://extreme.outervision.com/PSUEngine

I know its not 100% correct but it should get you in the ball park.