Will my XFX 550w power crossfire HD 7850'?

spat55 · Jun 20, 2013

Well it has 520w on the rail that they will be using along with my,

CPU: i5 3570k stock clocks.
GPU: Maybe HD 7850 Crossfired at 1100mhz core.

Now add in two case fans, which will be three at least if I crossfire plus a HDD I think I would be pushing it right? Was hoping someone has this kind of setup on a 550w PSU.

expl0itfinder · Jun 20, 2013

It would be cutting it very close. Running a 550w could be a risk. I would recommend at least a 600w.

mace200200 · Jun 20, 2013

In the tests done by Tom's the whole system with a single card was pulling just over 250w, add a second card and you'd be looking at about 400w max, so yes you'd be fine. Eventually you'll want to get a 600w.
http://www.tomshardware.com/reviews/radeon-hd-7870-review-benchmark,3148-19.html

ingtar33 · Jun 20, 2013

well the 7850 is a 130W gpu... assuming it's not overclocked, you're talking about 260W eaten up by gpu... yeah... you probably can run it.

Dark Lord of Tech · Jun 20, 2013

You would want to go with a good 650w.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817207022

XFX P1-650X-XXB9 650W ATX12V 2.2 & ESP12V 2.91 SLI Ready CrossFire Ready 80 PLUS BRONZE Certified Modular Active PFC Power Supply.

This will do the job.

spat55 · Jun 20, 2013

mace200200 :

I was thinking this too, although I have also thought about getting it, then releasing it wouldn't run and I'd have to get a new PSU, which I am hoping to do in 5 years time :lol:

When I built this last year I thought I should have brought a 1000w PSU just so it was future-proof, might make the HD 7850 and 1000w PSU my christmas present to myself

mace200200 · Jun 20, 2013

Err yea if your stressing your PSU like this it's not going to last 5 years,

spat55 · Jun 20, 2013

I'll just go with a 1000w I think, then if I do get some of the higher end cards SLI/Xross then I'll still be fine.

spat55 · Jun 20, 2013

mace200200 :

No that is true, atm it would though, but like I said, might make them my christmas present, a very early one....

expl0itfinder · Jun 20, 2013

spat55 :

1000w is overkill, as graphics cards are getting more and more efficient. 850w is the max you will ever need for a dual sli/crossfire config.

Dark Lord of Tech · Jun 20, 2013

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151110

SeaSonic X-SERIES X-1050 1050W ATX12V / EPS12V SLI Certified CrossFire Ready 80 PLUS GOLD Certified Full Modular Active PFC Power Supply.

Here you go, Haswell Certified and future proof!!!!!!!

mace200200 · Jun 20, 2013

X series is literally the best PSU on that market right now, the 750w ones for XFX are $130.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207029

spat55 · Jun 20, 2013

Think next time a make a build I will go all out and get myself one of these, problem is being in the UK it is harder to get these, here they are £220, shame I can't get someone on holiday to get me one :lol:

Dark Lord of Tech · Jun 20, 2013

Be careful using that under powered PSU with 2 cards.

AMD says min 600W for Crossfire.

spat55 · Jun 20, 2013

A cheap generic 600w they mean right? Really there guidelines are not that helpful.

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