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is my rig enough for GTX480 SLI? - Page 2

post #11 of 79
Quote:
Originally Posted by Timechange01 View Post
Would I cause any damage if I tried running the 2 cards with my 750w PSU? Just to see if its stable or not
look at the link you won't even be stressing a 750watt. You will be right at the efficiency curve. 500 watts is only 66% of the PSU, which would be right at optimum efficiency of the PSU. You want to use about about 50 to 60 percent.
post #12 of 79
Quote:
Originally Posted by Timechange01 View Post
Would I cause any damage if I tried running the 2 cards with my 750w PSU? Just to see if its stable or not
If anything it will just blue screen or reset.

BTW the Furmark power consumption doesn't take into account the rest of the system. Its about 500W for the two cards, 600W if they are overclcoked, probably another 100-200W for the CPU. Hard drives take up to 20W each, fans take a watt or two, all of it adds up, BTW Anandtech got a power draw of 800W+ from the wall during their testing. HardOCP got a similar amount.
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post #13 of 79
Quote:
Originally Posted by TickleMeElmo View Post
If anything it will just blue screen or reset.

BTW the Furmark power consumption doesn't take into account the rest of the system. Its about 500W for the two cards, 600W if they are overclcoked, probably another 100-200W for the CPU.
They measure the draw from the wall. meaning it takes into consideration the whole system PLUS the fact that a PSU isn't 100 percent efficient. The 750 watt is more then enough for SLI 480's.
post #14 of 79
Another artical for proof that the SLI 480's don't draw as much power as you think.
http://www.hardocp.com/article/2010/...0_sli_review/7
For so long people have been fed by marketing that you need a HUGE PSU, but in reality, you don't.
the ONLY time you need 1000 watts is when you are looking at 3 way and 4 way SLI.
post #15 of 79
Quote:
Originally Posted by thrasherht View Post
They measure the draw from the wall. meaning it takes into consideration the whole system PLUS the fact that a PSU isn't 100 percent efficient. The 750 watt is more then enough for SLI 480's.




Quote:
Originally Posted by HardOCP

http://www.hardocp.com/article/2010/...0_sli_review/7

We did see this, and it very much worth mentioning. With a nicely overclocked Core i7 920 processor (3.6GHz) and GTX 480 SLI, we saw at the wall wattages exceed 900 watts at the wall in some very stressful GPU system situation.
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post #16 of 79
Your sweet. Don't worry about power supply, it's more than enough. Enjoy the build.

Also, GTX570 might be a better deal.

Also, the above graph shows full load as 668. Corsair TX series can hold their rated wattage fine. all good
post #17 of 79
Quote:
Originally Posted by TickleMeElmo View Post
You just helped my point even more. 750 watts is overkill for SLI 480's
post #18 of 79
Quote:
Originally Posted by TickleMeElmo View Post
If anything it will just blue screen or reset.

BTW the Furmark power consumption doesn't take into account the rest of the system. Its about 500W for the two cards, 600W if they are overclcoked, probably another 100-200W for the CPU. Hard drives take up to 20W each, fans take a watt or two, all of it adds up, BTW Anandtech got a power draw of 800W+ from the wall during their testing. HardOCP got a similar amount.
You have failed to watch the video where they have the PSU plugged into the killawatt?
Watch it, I saw only just over 600 watts.
So Show me these numbers of 900+ watts? and how is the CPU and hard drives not included in the test if they are measuring the PSU draw?

Your argument is like swiss cheese dear sir.
http://www.hardocp.com/article/2010/...0_sli_review/7
post #19 of 79
Quote:
Originally Posted by thrasherht View Post
You just helped my point even more. 750 watts is overkill for SLI 480's
Look at all of the graphs, those are also AVERAGE loads, peak temps are likely much higher. I'm not saying it will not work, it will PROBABLY BE FULLY STABLE, but it's going to be close (also note that he has a seriously overclocked CPU and will likely overclock his GPU pretty high).

Buying a PSU is about considering the worst case scenario and the major components if all stressed at peak:
GTX480 : 300W*2=600W
i7 : 200W
Rest of system: 50W
Edited by TickleMeElmo - 2/6/11 at 11:30pm
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post #20 of 79
Might need to back down the OC on the CPU but I'm running 2 580's on the same PSU and their OC'd to 926/1852/2300 1.088v. My CPU is also OC'd to 4GHZ at 1.3v and I've got water cooling, 2 HDD's, bunch of fans and lights and it runs my rig fine. PSU does get a bit hot though.
TBH, The only time the PSU didn't have any power is when I OC'd my 920 to 4.2...
Edited by jamborhgini313 - 2/6/11 at 11:31pm
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