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Which psu is best for my setup?

jswizzy

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#1
Hey guys, I was wondering which psu would be better for a system that has two radeon hd6950's (unlocked shaders and overclocked to 6970) in crossfire setup and a i5-2500k cpu with a moderate overclock.

XFX 650W XXX Edition P1-650X-CAG9 Power Supply Sealed
http://compare.ebay.com/like/200592...edcd78f&itemid=200592013017&ff4=263602_309572

XFX 650W XXX Edition P1-650X-CAH9 Power Supply Sealed
http://compare.ebay.com/like/170601...edcd78f&itemid=170601897239&ff4=263602_309572

or

Corsair CMPSU-650TX 650-Watt TX Series 80 Plus Certified Power Supply
http://www.amazon.com/dp/B000X24ISU/?tag=tec06d-20
 
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#2
you don´t want a psu with just 2 pcie 6pin to power 2x 6950??? like the corsair.

and don´t save money on powersupply.

with your setup i would go for 750 or 850 watt.

there should be some good corsair or antec for 30$ more.

http://www.amazon.com/dp/B0046L2KQ6/?tag=tec06d-20
 
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#4
well the advice that is most given on this site is never skimp on a PSU. Look at my rig, I have a Corsair HX 1000 in it and it only pulls 450-500 watts @ full load. Also if you have a thread in another sites forums that has several responses, why come here and ask whats best?
 

jswizzy

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#5
i posted the same question on both forums at the same time just to get answers from a wider range of people you know. Now I'm confused... should i get a 650 xfx or the 750.... hmmmmm
 

manofthem

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#6
I'm running a Corsair TX750 with 2 6950's and havent noticed any power issue yet. I think my psu was like $115 like a month back. I wish I had gotten the 850 though...:(
 
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#7
I would go with the highest wattage you can afford :D Think of it this way, if u get an 800 - 1000 watt PSU you should be set for at least another build or 2 with it...

Edit: Ahh i see now, going at it from all Forum angles. My bad :p more opinions the better :D
 

crazyeyesreaper

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#8
get a good 750w unit with 2 6pin and 2 6+2pin PCIE connectors go for a good brand

those opinions are fine but they dont take capacitor agining into account as a powersupply ages it slowly becomes unable to supply its full power thus why most will suggest a higher wattage unit

im running 2x 6970s on an 850w psu and im still when fully overclocked pulling around 650-700w when i heat peak so while yea a 650w unit can do the trick id be hitting the max of the unit all the time under intense loads more often you hit that line the more often something is to go POP.

get a 750w minimum for dualcards recommending an 850w for reliable power long term.

750w units
XFX
XFX Black Edition P1-750B-CAG9 750W ATX12V v2.2 / ...
Corsair
CORSAIR HX Series CMPSU-750HX 750W ATX12V 2.3 / EP...
PC Power & Cooling
PC Power and Cooling Silencer 760W PPCS760 Max 760...

850w units
Corsair
CORSAIR HX Series CMPSU-850HX 850W ATX12V 2.3 / EP...
Cougar (ugly but a damn good unit)
COUGAR SX850 COUGAR-SX850 850W ATX12V / EPS12V SLI...

thats just 1 site try Tigerdirect as well for other deals / prices
 
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#9
most people don´t look for the specs just wattage.
so the xfx units are fine(also the corsair except of only 2x pcix) but i always recommend a little bit more and its the only part of a pc i take with me to the next build.

i have my corsair 100hx for 4-5 years now and hope for more to come.