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850w enough for quadfire 5850?

post #1 of 7
Thread Starter 
XFX Core Edition 850W, I'll be changing to this.

Ive read some reviews and seems to be a decent PSU.

cpu 965 C3= 125w, overclocked 1.45v maybe 160wish?
GPU: 4x 5850= 4*150w= 600w.

total 760w.

these *maybe* 40w at load? M4a79t deluxe mobo, 2x2gb DDR3, 2.5" Extreme 3 120gb SSD, HAF 932 fans + 3 120mm fans.

total: 800w

it should leave 40-50w head room?

PSU 12v: 70A*12v= 840w.
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post #2 of 7
That is a good quality psu so it should power that rig just fine.

BTW, is there a reason you are going quadfire? Quadfire has terrible scalling. 2x6950's unlocked will be much better imo.
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post #3 of 7
Should be fine yeah. Good luck with quadfire though, I don't think that ever worked right (or scaled very well at all when it worked right).
post #4 of 7
One 5850 takes about 150W under load. So 4 would take about 600W. So yea should work.
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post #5 of 7
As said above, quad fire has garbage scaling. You'd be wasting your money.
post #6 of 7
Thread Starter 
thanks for replies, Ive read som articles and it seemed that trifire scaled much better than crossfire I think quad was similar to trifire scaling.

I'll look in my bookmarks later to see the article, I'm a bit tired right now.

would you mean quadfire scaling or game play/feel in general.

edit---> I found one that compares 5970 +5850 vs 5970, I don't know if that is similar to 3x 5850 vs 2x 5850.

at bottom of Original post is comparison: http://www.techpowerup.com/forums/sh...d.php?t=112113

here is call of pripyat picture, min fps is low difference but average and maximum are significant: http://img39.imageshack.us/f/copcom.jpg/

edit2 ---> maybe you meant that 69xx scales better than 5850?
From my own experience crossfire 5850 scales 50-70% more compared to one 5850.
seems like maybe 3 5850 would scale 70% more than 2 5850 which makes it scale better than crossfire?

edit3---> I have crossfire 5850, maybe I should invest in 69xx or another gen gpu's?
I feel that at 1gb and 5850 and eyefinity 5760*1080 is too little memory for future.
I'll have to simply upgrade to new gpu's.
Edited by grandpatzer - 3/9/11 at 10:17am
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post #7 of 7
2 5850's uses as much power as one 580 so it should be fine
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