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Can My Power Supply handle crossfire?

post #1 of 30
Thread Starter 
hi guys, i was looking around, and i found a 5830 for cheap, around 120 bucks, no tax, and i was like....
anyways, i was thinking about it, then i pulled an ammeter and split the power cord from the back of my PC, careful not only get though the rubber and not touch the metal wires inside, i ran Prime 95 + and older copy of FurMark, to get maximum power, now it sucked about 400 watts from the wall, but that doesnt necessarily mean a 400W PSU is needed,

anyways i have an Ultra LSP 750W PSU, and its rated for 78% efficiency,, since im pulling 400W from the wall, do you think that my PSU can handle a second one? now if i did the math simply, it would work out to around 600W ish... from the wall, but i remember that some PSU's are rated for MAX output, not sustained output, so if my current PSU can handle crossfire 5830s than ill grab it, if not than i wont buy the second 5830
Edited by Pentium4 531 overclocker - 4/3/11 at 6:37pm
    
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post #2 of 30
Very easily..
post #3 of 30
Thread Starter 
Quote:
Originally Posted by charlie97 View Post
Very easily..
so you think my PSU can handle that much power SUSTAINED? because unlike Corsair or Seasonic, Many PSU companies out there write down the MAX output, not MAX SUSTAINED.... and the fact that i got this thing for 60 bucks scares me...
    
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post #4 of 30
Yep your psu can take that. But Ultra isn't the best so maybe get a new Antec, Corsair, XFX, Seasonic psu.
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post #5 of 30
Quote:
Originally Posted by Pentium4 531 overclocker View Post
so you think my PSU can handle that much power SUSTAINED? because unlike Corsair or Seasonic, Many PSU companies out there write down the MAX output, not MAX SUSTAINED.... and the fact that i got this thing for 60 bucks scares me...
They only rate it like 100 above at max.
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post #6 of 30
Thread Starter 
Quote:
Originally Posted by nbmjhk6 View Post
Yep your psu can take that. But Ultra isn't the best so maybe get a new Antec, Corsair, XFX, Seasonic psu.
i know, i would have bought an antec earthwatts, or the Seasonic 650W from NCIX, but i didnt know about this when i was buying a PSU.. so i cheaped out and grabbed an Ultra PSU... next time im grabbing a modular Corsair PSU.. but the idea is to not buy a new PSU, so...
Quote:
Originally Posted by nbmjhk6 View Post
They only rate it like 100 above at max.
true... so.. a 750 W PSU.. drawing 600W from the wall, .. at 78% efficiency is..about 470W and if my 750 watt PSU cant put out a tad over half of its rated power, then i would get really pissed off.... but then again, iv seen some pretty silly things.. my old 350W PSU choked on itself and started restarting my PC in games at a load of only 120W
Edited by Pentium4 531 overclocker - 4/3/11 at 6:45pm
    
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post #7 of 30
Unless you're pushing everything consistently to 95%-100% usage, you won't be pulling 600w all the time. (unless you're running furmark 24/7)
You'll be just fine....how old is that psu?
post #8 of 30
Thread Starter 
Quote:
Originally Posted by mongoloid View Post
Unless you're pushing everything consistently to 95%-100% usage, you won't be pulling 600w all the time. (unless you're running furmark 24/7)
You'll be just fine....how old is that psu?
about a year old, since i built the rig =P and its pulling 600W not outputting 600W, its rated for output, but i just need verification that my PSU can output the close to 500W of power that i need to run this settup, also your Tri-SLI is uber smexy
    
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post #9 of 30
Indeed...what was I thinking.
Pity Phaedrus or TwoCables isn't around...I'd go with what either of them said.

I believe you'll be fine...for how long, not so sure.
post #10 of 30
Well, your system is only really pulling somewhere between 300-350W when factoring in efficiency, so even on a sub-par PSU, you'll be perfectly fine.
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