Best PSU >= 850W for 3570k build?

S0L0

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May 18, 2012
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Here is my build:

i5-3570k - 100W
GIGABYTE GA-Z77MX-D3H - 100W
Corsair Vengeance 32GB(4x8GB) -15W x4
2TB 7200 RPM Hard drive (Raid) 10W x 5
240GB SSD - 10W
Radeon HD 7850 OR GTX 660 (CF/SLI) - 100W x 2
Fans - 3W X 5

Total = 535W * 1.5(Efficiency Multiplier) = 800W

So far I'm considering:
Corsair Professional Series Gold AX850 - 174
Cooler Master RS850-AMBAJ3-US Silent Pro M 850W Power Supply -114
Cooler Master RSA00-AMBAJ3-US Silent Pro M 1000W - 187
XFX P1850SNLB9 Core Edition Power Supply - 850W -106
XFX P1-1050-BEFX ProSeries Black Edition 80Plus Gold - 169
 


Nooo, LOL. 1000W would be more like a tri or quad GPU config. 750W is plenty for a dual card setup.

Also, that 500W recommendation is for total system wattage, not just the GPU.
 

500w is for the whole system, the card is a small part of that.

Anyways they over estimate on the recommendation. 500w should be able to run 2 7850s.
 

InvalidError

Titan
Moderator

A lot of that 500W is simply because many cheap 400W PSUs fail at 300-350W. A high-end system with a single 7870 draws ~320W from the wall, which means ~290W DC for system components assuming 90% PSU efficiency, less than 175W of which being the 7870.

When you add a second GPU card, you do not double the number of motherboards, fans, CPUs, HDDs, etc. in the system so that part of the power budget which may account for ~150W does not get doubled, only the card's nominal power does, which means "only" ~175W more. This brings the power requirement in the neighborhood of 470W so in principle, a PSU rated for 550W continuous power would be sufficient.

For safety margin, headroom and higher efficiency, you want to operate the PSU at less than 75% load which knocks optimal PSU selection in the 700-850W ballpark.
 
I'd use an 850 watter if you are OC'ing the CPU and 660 Ti HesGPU's, 750 if not.

For the price, nothing can touch the Antec CP-850 (10.0 jonnyguru performance rating)

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=142

It is completely unmatched by any ATX unit on the market I can think of. You'd have to spend twice as much as this thing costs to find the next best thing, performance wise.

You'll need to use a Antec case (1200, DF-85, P183 or P193) to use it though.....all four of which are superb cases.

The HX850 is a better PSU than the AX series .... at leats if you are interested in voltage stability and ripple ..... which is far more important that efficiency.

HX850 (10.0 performance rating)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=153

AX850 (9.5 performance rating)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=197

XFX Core Edition (9.5 performance rating)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=217

XFX Black Edition (10.0 performance Rating)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=165

I'd cross Coolermater and OCZ right off the list

OCZ Z Series (88.5 Performance rating)
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=167

Corsair TX series generally garners a 9.5

Finally with the $210 560 Tis (900Mhz version) having a performance edge over the $260 7850 (Guru3D's game test suite), I wouldn't have that on my list.....nVidia can't release the 660 Ti at a comparable price / performance as the 7850 as they would be competing with their own 560 Ti.
 

S0L0

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May 18, 2012
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Ive narrowed it down to:

XFX 850W PRO850W XXX Edition - 120
Corsair TX850M - 114 - 119
Corsair TX850 V2 (shares same internal design as XFX 850 Core Edition) - 130
Corsair AX750 - 150
Corsair HX850 - 150(deal just ended)
 

S0L0

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May 18, 2012
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Its being said the price point of the 660 is 200 - 300, maybe 660ti 350, 560ti might out perform 7850 on a few games, but ati is still a better buy in this case. Anyway I don't want to change the topic here, You should check out this thread about the 660 vs 7850:

http://www.tomshardware.com/forum/276116-29-worth-wait
 

S0L0

Honorable
May 18, 2012
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Its down to:

XFX 850W PRO850W XXX Edition 80 Plus Silver- 120
Corsair Professional Series HX750 80 Plus Silver - 130
Corsair HX-850 80 Plus Silver - 150
Corsair Professional Series AX750 80 Plus Gold - 150
Seasonic X-760 80 Plus Gold - 165
Corsair Professional Series AX850 80 Plus Gold - 169
XFX PRO1050W Black Edition 80 Plus Gold - 169