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Once again, power consumption is overblown (470 SLI)...

post #1 of 29
Thread Starter 
I made a thread here, maybe a month ago, about SLI'ing GTX470's on an X650. Honestly, I was pretty skeptical myself. I bought one anyway and, instead of just SLI'ing them, I threw my 8800GT in there as a Phys-X card and then OC'd all three cards. The result? Power requirements are grossly exaggerated...

GTX 470 #1 - 800/1740 @ 1.087
GTX 470 #2 - 800/1740 @ 1.075
8800GT - 640/1720/950


Edited by AyeYo - 1/5/11 at 2:40pm
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post #2 of 29
Are you running, hdtune, and pcct gpu/cpu all at the same time? I always knew people always think they need more. I bought a 750 thinking I would upgrade my stuff to actually use but then decided to put $$ in my man cave instead. My rig 100% max is like 430 i belive, been a while since I pulled out the kill-a-watt
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post #3 of 29
Thread Starter 
Yea, I probably should have mentioned this is with FAH running on all GPU's and the CPU.
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post #4 of 29
Wow, while folding? That's impressive. I already knew a good 650W was fine for two GTX 470s, but with a PhysX card, overclocking and while folding is unexpected.
post #5 of 29
Quote:
Originally Posted by Shub View Post
Wow, while folding? That's impressive. I already knew a good 650W was fine for two GTX 470s, but with a PhysX card, overclocking and while folding is unexpected.
i would just make sure it's a trusted power supply first and using a seasonic you cant get much better there
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post #6 of 29
DAMN!! That is impressive. Makes me feel better about my 750 running all my crap.
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post #7 of 29
They're grossly exaggerated by a lot of people, a good 750w unit will run about any 2 way SLI or Xfire rig you care to name (unless they're dual gpu cards, in which case you may need an 850w)
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post #8 of 29
People recommending 750w are right in a sense, lower load = higher efficiency to a point. Anything higher is pure ignorance though.

you are running a dual core though...
post #9 of 29
This brings up a valid problem, for the average computer the power needs are, well average. One can look up the wattage/amperage numbers for each component in the computer with a maximum value and choose from that number, or you can run one of those PSU calculators, which always will end up with fat numbers. I think a spreadsheet showing different systems (generic) would be helpful for others thinking about buying a PSU. Asking here on this forum or others does help as well. I'll admit I ran my numbers fat when I chose a PSU, but I am humbled to the fact that you might need as much power as one might think. Food for thought.
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post #10 of 29
Thread Starter 
Quote:
Originally Posted by linkin93 View Post
you are running a dual core though...
This does make a difference, although I don't know how much. It's 73w TDP, which includes the iGPU that isn't in use. So say it's a 60w processor, that's still only 35w shy of an 1156 i7. Although I don't know if additional power requirements scale differently with OC'ing. Regardless, with just under 600w being pulled from the wall, I now have no worries about upgrading to an i7 on this PSU. Assuming 90% efficiency, that still leaves me 110w of headroom before I hit the PSU's rating (which it can easily surpass by 50-100w without issue).
Finally an update
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Finally an update
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