Is it worth it to buy a more expensive PSU for less watts?

iamtheone · Jan 16, 2011, 05:16 PM

Lets say I need 600w max draw. I can buy a 850W for say $100. Or a 650W for $135.

My mate says I should go for the more expensive PSUs from Corsair or Seasonic instead of "cheaping out on the PSU", by which he means most other brands.

I mean, is that worth it/recommended? Surely a bigger wattage number at a lower price = win?

brandonwh64 · Jan 16, 2011, 05:18 PM

Yea i wouldn't buy a cheap PC for a expensive rig. I would get Corsair, Enermax, Seasonic, and other high end brands. Even if you buy the higher wattage PSU, It will not use 850W 24/7, it will only use what your components ask for

cdawall · Jan 16, 2011, 05:19 PM

http://www.jonnyguru.com/modules.php...Story&reid=187

thats what happens when you buy a higher wattage low cost unit looks nice doesn't even hit 600w

get a corsair/seasonic

TRIPTEX_CAN · Jan 16, 2011, 05:22 PM

I would say your friend is mostly right but its not just about the money. Knowing the reputation of the brand you choose is more important than price alone. When shopping for a PSU I look at the wattage I need and then see what the top brands have for sale in that market. Usually I just buy Corsair.

iamtheone · Jan 16, 2011, 05:23 PM

Quote:

Originally Posted by cdawall

http://www.jonnyguru.com/modules.php...Story&reid=187

thats what happens when you buy a higher wattage low cost unit looks nice doesn't even hit 600w

get a corsair/seasonic

they only happen to cost a fair bit more than the competition is all

I just thought the PSU would be a nice place to save $40.

The rest of my rig components is $$$, i5-2500k, hd6970, corsair vengeance ram, corsair ssd, msi gd65 mobo etc

TRIPTEX_CAN · Jan 16, 2011, 05:25 PM

Quote:

Originally Posted by iamtheone

they only happen to cost a fair bit more than the competition is all

I just thought the PSU would be a nice place to save $40.

The rest of my rig components is $$$, i5-2500k, hd6970, corsair vengeance ram, corsair ssd, msi gd65 mobo etc

Unless a killer PSU is on sale for a good price you should never really save on the PSU. Save on things like optical drives or recycling an old full ATX case.

Jamborhgini313 · Jan 16, 2011, 05:27 PM

CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready...

Single 60A Rail for 100 bucks

or if your planning on buying another 6970,
CORSAIR HX Series CMPSU-850HX 850W ATX12V 2.3 / EP...

That thing acts like a 1k watt according to johnnyguru

cdawall · Jan 16, 2011, 05:36 PM

Quote:

Originally Posted by iamtheone

they only happen to cost a fair bit more than the competition is all

I just thought the PSU would be a nice place to save $40.

The rest of my rig components is $$$, i5-2500k, hd6970, corsair vengeance ram, corsair ssd, msi gd65 mobo etc

900W, 880W, 875W, 860W, 850W, 800W, 780W, 775W, ...

pick off of that list and you should be good to go i suggest on of these specifically

Recertified: PC Power and Cooling Silencer 750 Qua...

SILVERSTONE DA700 700W ATX 12V 2.2 & EPS 12V SLI C...

Quote:

Originally Posted by Jamborhgini313

CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready...

Single 60A Rail for 100 bucks

or if your planning on buying another 6970,
CORSAIR HX Series CMPSU-850HX 850W ATX12V 2.3 / EP...

That thing acts like a 1k watt according to johnnyguru

that overkill for a pair of 6970...i ran way more off of a thermaltake TR2 RX-850

MxPhenom 216 · Jan 16, 2011, 05:37 PM

My friend got a rosewill 1000w psu and i laughed at him. He got it because of the led fan

iamtheone · Jan 16, 2011, 05:37 PM

Quote:

Originally Posted by Jamborhgini313

CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready...

Single 60A Rail for 100 bucks

or if your planning on buying another 6970,
CORSAIR HX Series CMPSU-850HX 850W ATX12V 2.3 / EP...

That thing acts like a 1k watt according to johnnyguru

Well I don't think i'll be adding another hd6970. But I will be overclocking the solo hd6970 to it's max, as well as overclocking the i5-2500k to it's max (got a Zalman CNPS 9900 MAX ready for that).

I reckon I'll only need like 550W max with everything?

THRiLL KiLL · Jan 16, 2011, 05:38 PM

Quote:

Originally Posted by cdawall

http://www.jonnyguru.com/modules.php...Story&reid=187

thats what happens when you buy a higher wattage low cost unit looks nice doesn't even hit 600w

get a corsair/seasonic

it ryhmes!

TIGR · Jan 16, 2011, 05:49 PM

Saying "more expensive PSUs are better than cheap ones" is too vague and sometimes true but not always.

Saying "certain PSU brands are better than others" is too vague and, while often true, does not always guarantee you will get a good unit.

You don't always get what you pay for, and just about every brand puts out some quality units and some potentially dangerous ones. You can also pay far more than you need to if you go by brand alone. You really have to choose on a model by model basis. To illustrate, Rosewill has a 650w PSU that has been shown to fail to put out its rated power cleanly, whereas Rosewill also sells a 630w that has been shown to be good for about 670w.

If you're not well in touch with which units are good models and which aren't, I would suggest asking for a specific model suggestion for your build.

Bow · Jan 16, 2011, 05:53 PM

Quote:

Originally Posted by nvidiaintelftw

My friend got a rosewill 1000w psu and i laughed at him. He got it because of the led fan

I have a friend that did the same thing, like the kights, not sure what brand it was.

Kreij · Jan 16, 2011, 05:55 PM

IMO, you should not skimp on the PSU. The case and the PSU are the two components that you will most likely keep the longest as you upgrade.

A PSU usually runs most efficiently as you get closer to 50% of its rated output, so getting a larger PSU to handle 600w (ie. 850w) will be more efficient than getting a 650w.

cdawall · Jan 16, 2011, 05:57 PM

Quote:

Originally Posted by Kreij

IMO, you should not skimp on the PSU. The case and the PSU are the two components that you will most likely keep the longest as you upgrade.

A PSU usually runs most efficiently as you get closer to 50% of its rated output, so getting a larger PSU to handle 600w (ie. 850w) will be more efficient than getting a 650w.

thats not always true part of 80+ rating is 20% 50% and 100% so yes at 50% it might be more efficient but they are designed to run 100%...that being said in a hot room most PSU's will not hold up to being pushed close to 100% i popped my OCZ modxtreme pro after about 1.5yrs due to TX summers and not running the ac all the way down.

Kreij · Jan 16, 2011, 06:00 PM

I agree, cd, but my statement is true. They are the most efficient in the middle of their rated output.
I buy 80 gold for that reason. Seasonics or Corsair.
Plus I like the spiffy black and gold velvet bags they come in.

Robert-The-Rambler · Jan 16, 2011, 06:00 PM

Quote:

Originally Posted by nvidiaintelftw

My friend got a rosewill 1000w psu and i laughed at him. He got it because of the led fan

They have sloppy cabling but actually provide rated power output. Johnny Guru gave the power supply in my system specs about an 8 out of 10. Hey and I do like the blue LED. Johnny Guru is a good place to find out general quality but you also have to keep in mind that more than likely you will never put the stress they put on the supplies. They kind of remind of mythbusters over there and their methods of testing are a little extreme but quite funny at times and informative.

I try to always stick to the philosophy of getting twice the power you actually need. I do the same with audio equipment. Electronic components in general work better and last longer when they are not being stressed too hard.

AsRock · Jan 16, 2011, 06:04 PM

Quote:

Originally Posted by Kreij

IMO, you should not skimp on the PSU. The case and the PSU are the two components that you will most likely keep the longest as you upgrade.

A PSU usually runs most efficiently as you get closer to 50% of its rated output, so getting a larger PSU to handle 600w (ie. 850w) will be more efficient than getting a 650w.

And has the power to fry every thing in the computer.

AlienIsGOD · Jan 16, 2011, 06:11 PM

I purposely did research when picking out my Corsair HX1000W. Its more than I will EVER need, but its damn good in every aspect. I would much rather pay $200 + for a reliable, quality PSU; rather than shell out ~$100 for a less than respectable PSU that will crap put in less than 6 months under everyday usage....

iamtheone · Jan 16, 2011, 06:13 PM

Quote:

Originally Posted by TIGR

If you're not well in touch with which units are good models and which aren't, I would suggest asking for a specific model suggestion for your build.

How about these 2? Both are around the same price and 650W. The Corsair is Bronze rated, while the NZXT is Gold rated. They're roughly the same price for same watt except the latter is Gold rated.

http://www.scan.co.uk/products/650w-...-12v-120mm-fan
http://www.scan.co.uk/products/650w-...-12v-140mm-fan

I used the Corsair power supply configurator and it recommended me a 650W one. Will be overclocking everything.

Intended System Specs

EastCoasthandle · Jan 16, 2011, 06:21 PM

You shouldn't skimp on the PSU. Buying a decent PSU at a wattage and price range you are comfortable with is is better then just getting one on cheap. Sometimes you find a decent PSU on sale, etc. You should look for a PSU that has:
-Decent 80 Plus rating
-Adequate amperage for the 3.3V, 5.0V and 12.0V rails from the label
-Fits your PC case without compromises
-Wattage that you believe is adequate for your use

Those are just a few examples. But it's common to see better PSUs prices higher then others in the same wattage range.

TIGR · Jan 16, 2011, 06:26 PM

Quote:

Originally Posted by Kreij

A PSU usually runs most efficiently as you get closer to 50% of its rated output, so getting a larger PSU to handle 600w (ie. 850w) will be more efficient than getting a 650w.

This is true, but with two important caveats:

1. The efficiency curves of different models varies as wildly as the torque curves of different engines. Some can have such steep curves that their efficiency varies over 10% between 50% load and 90% load. Others have such flat curves that the difference in efficiency between 50% and 90% is negligible.

2. "Getting a larger PSU to handle 600w (ie. 850w) will be more efficient than getting a 650w." That is true if you are actually running at 600w on average. Unless you're running software (e.g. Folding@home) that puts your system under close to 100% load 24/7, your system's average power consumption will be significantly lower (usually >50% lower for a gaming rig) than its peak power consumption. So for most people, buying a PSU that is most efficient at their system's peak power consumption level will not result in the best average efficiency.

Quote:

Originally Posted by iamtheone

How about these 2? Both are around the same price and 650W. The Corsair is Bronze rated, while the NZXT is Gold rated. They're roughly the same price for same watt except the latter is Gold rated.

http://www.scan.co.uk/products/650w-...-12v-120mm-fan
http://www.scan.co.uk/products/650w-...-12v-140mm-fan

I used the Corsair power supply configurator and it recommended me a 650W one. Will be overclocking everything.

Intended System Specs

Checking into this now. Will take a bit.

Kreij · Jan 16, 2011, 06:33 PM

The gold rated PSU use better components.
They have to do so, as they need to keep much tighter tolerances to maintain the efficiency rating over a broader output range.
By their nature, these better components will deliver cleaner power.

Whether you need that level of PSU is your decision.
Most 80+ anything will be fine for the average user/gamer.

TIGR · Jan 16, 2011, 06:47 PM

Quote:

Originally Posted by iamtheone

How about these 2? Both are around the same price and 650W. The Corsair is Bronze rated, while the NZXT is Gold rated. They're roughly the same price for same watt except the latter is Gold rated.

http://www.scan.co.uk/products/650w-...-12v-120mm-fan
http://www.scan.co.uk/products/650w-...-12v-140mm-fan

I used the Corsair power supply configurator and it recommended me a 650W one. Will be overclocking everything.

Intended System Specs

80Plus Test Results
Corsair 650HX
NZXT HALE90-650-M

The Corsair has more/better connectors while the NZXT has 2 amps more on the 12v rail. The Corsair is far more well-known and tested while the NZXT is clearly more efficient across the board. Without knowing what type of fan is in the NZXT, its longevity is an unknown. FWIW, the 850w version of the NZXT tests well, putting out nearly 100ow of power cleanly (link).

I would guess that your system is going to have an average draw of under 250w due to the amount of time the average system spends idling (unless you put it under heavy load for the majority of the time, as in 8 hours a day or more). Its peak power consumption should also be well under 600w.

AltecV1 · Jan 16, 2011, 06:58 PM

my favorite PSU http://www.jonnyguru.com/modules.php...=Story&reid=84 most guys who build PCs in my country use that PSU and i fell in love with it......its just so quiet, my 600W stealtXstream seems like a jet engine compared to the blue storm 2

Jan 16, 2011, 05:16 PM	#1
iamtheone Join Date: Jan 2011 Posts: 32 (0.04/day) Thanks: 1 Thanked 0 Times in 0 Posts	Is it worth it to buy a more expensive PSU for less watts? Lets say I need 600w max draw. I can buy a 850W for say $100. Or a 650W for $135. My mate says I should go for the more expensive PSUs from Corsair or Seasonic instead of "cheaping out on the PSU", by which he means most other brands. I mean, is that worth it/recommended? Surely a bigger wattage number at a lower price = win?

Jan 16, 2011, 05:18 PM	#2
brandonwh64 Addicted to Bacon and StarCrunches!!! Join Date: Sep 2009 Location: Chatsworth, GA Posts: 13,560 (10.04/day) Thanks: 2,138 Thanked 5,338 Times in 3,695 Posts System Specs	Yea i wouldn't buy a cheap PC for a expensive rig. I would get Corsair, Enermax, Seasonic, and other high end brands. Even if you buy the higher wattage PSU, It will not use 850W 24/7, it will only use what your components ask for __________________ Cruncher's: All GPU's GPU's: 7970 3GB Unlocked = 8 Threads 5770 1GB OCed = 2 Threads

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Jan 16, 2011, 05:19 PM	#3
cdawall where the hell are my stars Join Date: Jul 2006 Location: some AF base Posts: 16,021 (6.43/day) Thanks: 457 Thanked 2,753 Times in 2,222 Posts System Specs	http://www.jonnyguru.com/modules.php...Story&reid=187 thats what happens when you buy a higher wattage low cost unit looks nice doesn't even hit 600w get a corsair/seasonic __________________

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Jan 16, 2011, 05:22 PM	#4
TRIPTEX_CAN Join Date: Feb 2008 Location: BC.CAN Posts: 2,342 (1.22/day) Thanks: 805 Thanked 726 Times in 554 Posts System Specs	I would say your friend is mostly right but its not just about the money. Knowing the reputation of the brand you choose is more important than price alone. When shopping for a PSU I look at the wattage I need and then see what the top brands have for sale in that market. Usually I just buy Corsair. __________________ “come to canada and I'll put my maple syrup in your mouth”

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Jan 16, 2011, 05:27 PM	#7
Jamborhgini313 Join Date: Apr 2009 Posts: 173 (0.12/day) Thanks: 33 Thanked 26 Times in 22 Posts System Specs	CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready... Single 60A Rail for 100 bucks or if your planning on buying another 6970, CORSAIR HX Series CMPSU-850HX 850W ATX12V 2.3 / EP... That thing acts like a 1k watt according to johnnyguru __________________

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Jan 16, 2011, 05:37 PM	#9
MxPhenom 216 Knowledgeable Posting Whore Join Date: Aug 2010 Location: Seattle, WA Posts: 5,724 (5.77/day) Thanks: 1,264 Thanked 1,074 Times in 827 Posts System Specs	My friend got a rosewill 1000w psu and i laughed at him. He got it because of the led fan

System Name:	My System
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CRT/LCD Model:	HP w2558hc
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PSU:	Ocz ModXtream 700
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Jan 16, 2011, 05:49 PM	#12
TIGR Join Date: Aug 2008 Location: Minnesota, USA Posts: 2,098 (1.21/day) Thanks: 739 Thanked 1,030 Times in 598 Posts System Specs	Saying "more expensive PSUs are better than cheap ones" is too vague and sometimes true but not always. Saying "certain PSU brands are better than others" is too vague and, while often true, does not always guarantee you will get a good unit. You don't always get what you pay for, and just about every brand puts out some quality units and some potentially dangerous ones. You can also pay far more than you need to if you go by brand alone. You really have to choose on a model by model basis. To illustrate, Rosewill has a 650w PSU that has been shown to fail to put out its rated power cleanly, whereas Rosewill also sells a 630w that has been shown to be good for about 670w. If you're not well in touch with which units are good models and which aren't, I would suggest asking for a specific model suggestion for your build.

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PSU:	XFX Black Edition XPS-850W 80 Plus Silver
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Jan 16, 2011, 05:55 PM	#14
Kreij Hardcore Monkey Moderator Join Date: Feb 2007 Location: Cheeseland (Wisconsin, USA) Posts: 12,110 (5.28/day) Thanks: 591 Thanked 5,488 Times in 2,932 Posts System Specs	IMO, you should not skimp on the PSU. The case and the PSU are the two components that you will most likely keep the longest as you upgrade. A PSU usually runs most efficiently as you get closer to 50% of its rated output, so getting a larger PSU to handle 600w (ie. 850w) will be more efficient than getting a 650w. __________________ Cloud (noun, singular): A dynamic arrangement of multiple potential single points of failure, with a user at one end and their data at the other. Get more tech news on a wide variety of topics at NextPowerUp

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Video Card:	2 x Sapphire Radeon HD6970
Hard Disk:	2 x Seagate Barracuda 320GB in RAID 0
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CRT/LCD Model:	Dell 3007WFP 30" LCD (2560 x 1600)
Case:	Thermaltake Armor w/ 250mm Side Fan
Sound Card:	SupremeFX 8ch Audio
PSU:	Thermaltake Toughpower 750W Modular
Software:	Win8 Pro x64 / Cat 12.10

Jan 16, 2011, 06:00 PM	#16
Kreij Hardcore Monkey Moderator Join Date: Feb 2007 Location: Cheeseland (Wisconsin, USA) Posts: 12,110 (5.28/day) Thanks: 591 Thanked 5,488 Times in 2,932 Posts System Specs	I agree, cd, but my statement is true. They are the most efficient in the middle of their rated output. I buy 80 gold for that reason. Seasonics or Corsair. Plus I like the spiffy black and gold velvet bags they come in. __________________ Cloud (noun, singular): A dynamic arrangement of multiple potential single points of failure, with a user at one end and their data at the other. Get more tech news on a wide variety of topics at NextPowerUp

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PSU:	Rosewill Xtreme Series RX850-D-B 850W Continuous @40°C 80 PLUS Certified
Software:	Windows Vista Ultimate 64 bit

System Name:	weeeeeeeeeeeeeeeeeee
Processor:	i5 2500k \ i7 3770k
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Jan 16, 2011, 06:11 PM	#19
AlienIsGOD Join Date: Aug 2008 Location: Kingston, Ontario Canada Posts: 2,578 (1.48/day) Thanks: 4,293 Thanked 1,085 Times in 618 Posts System Specs	I purposely did research when picking out my Corsair HX1000W. Its more than I will EVER need, but its damn good in every aspect. I would much rather pay $200 + for a reliable, quality PSU; rather than shell out ~$100 for a less than respectable PSU that will crap put in less than 6 months under everyday usage.... __________________ Crunching Badges Crunching Hardware CPU: i5 3570K and i5 2400 = 8 cores GPU: 7870 (8 wu's) and 7770 (4 wu's) = 1920 GCN cores (no GPU wu's atm)

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Memory:	Mushkin Blackline 4GB x 2 1600mhz XMP profile \| Kingston HyperX 4GB x 2 1600mhz XMP profile \| 6GB
Video Card:	Sapphire 7870 2GB OC \| Gigabyte R7770 1GB \| HD4250
Hard Disk:	500GB OS / 500GB Data \| Kingston HyperX 120GB SSD / 2 x Seagate 500GB \| 320GB
Optical Drive:	Asus 22x DVD/CD Combo Drive \| ? \|
CRT/LCD Model:	LG Flatron IPS226 22" IPS 5ms \| Phillips 227E 22" IPS 7ms / 40" Samsung 550 LCD HDTV \| 15.6" LCD
Case:	Antec P280 \| Thermaltake Soprano Snow Edition
Sound Card:	Realtek ALC898 w/ Logitech z623 \| Realtek ALC892 w/ SB X-FI MB2 software w/ Logitech x540
PSU:	Corsair HX1000W \| Thermaltake TR2 500W
Software:	Windows 7 Home 64 Bit \| Windows 7 Home 64 Bit \| Windows 7 Home 64 Bit
Benchmarks:	benchmarks are for noobs, real men crunch WCG for TPU \m/

Jan 16, 2011, 06:21 PM	#21
EastCoasthandle Eligible for custom title Join Date: Apr 2005 Posts: 6,244 (2.12/day) Thanks: 382 Thanked 1,526 Times in 865 Posts System Specs	You shouldn't skimp on the PSU. Buying a decent PSU at a wattage and price range you are comfortable with is is better then just getting one on cheap. Sometimes you find a decent PSU on sale, etc. You should look for a PSU that has: -Decent 80 Plus rating -Adequate amperage for the 3.3V, 5.0V and 12.0V rails from the label -Fits your PC case without compromises -Wattage that you believe is adequate for your use Those are just a few examples. But it's common to see better PSUs prices higher then others in the same wattage range. __________________ Windows 7 Club!, Online Gaming Lag and You GPU/CPU Water Cooling Club, Q9650 OC'd vs 2600K Stock PC Air Cooling Club, Game Performance Tips

Jan 16, 2011, 06:33 PM	#23
Kreij Hardcore Monkey Moderator Join Date: Feb 2007 Location: Cheeseland (Wisconsin, USA) Posts: 12,110 (5.28/day) Thanks: 591 Thanked 5,488 Times in 2,932 Posts System Specs	The gold rated PSU use better components. They have to do so, as they need to keep much tighter tolerances to maintain the efficiency rating over a broader output range. By their nature, these better components will deliver cleaner power. Whether you need that level of PSU is your decision. Most 80+ anything will be fine for the average user/gamer. __________________ Cloud (noun, singular): A dynamic arrangement of multiple potential single points of failure, with a user at one end and their data at the other. Get more tech news on a wide variety of topics at NextPowerUp

Jan 16, 2011, 06:58 PM	#25
AltecV1 Join Date: Dec 2008 Location: Republic of Estonia Posts: 1,248 (0.78/day) Thanks: 158 Thanked 175 Times in 144 Posts System Specs	my favorite PSU http://www.jonnyguru.com/modules.php...=Story&reid=84 most guys who build PCs in my country use that PSU and i fell in love with it......its just so quiet, my 600W stealtXstream seems like a jet engine compared to the blue storm 2

Processor:	C2D E8400@3.6 ghz
Motherboard:	ASUS P5KPL-AM
Cooling:	Freezer 7 pro
Memory:	Kingston 4GB 800Mhz cl6
Video Card:	Sapphire HD4850 700/1000 + Accelero S1 Rev. 2
Hard Disk:	WD 250 GB AAKS
Optical Drive:	broken samsung
CRT/LCD Model:	22" Samsung SyncMaster 226BW
Sound Card:	int.
PSU:	Forton Blue Storm II 500W
Software:	Windows 7 64bit Ultimate

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