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is my rig enough for GTX480 SLI? - Page 4

post #31 of 79
Quote:
Originally Posted by Timechange01 View Post
I dont plan to overclock my video cards at all after I get the second GTX480. I guess I can also lower the clocks on my CPU as well
If the Vcore is 1.4v+, I would definately back it down. I'm barely getting by with the 750w. I notice slow downs in SLi and that my 2nd 580 usage goes down when my PSU is going over the limit

@v1ral,
that PSU is actually an 1,000 watt according to johnnyguru and its one of the best PSU out there
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post #32 of 79
480 SLI at stock can run fine on 750W. However, 480 SLI when overclocked are very leaky and power hungry.

A good quality 850W can handle a moderate OC on 480 SLI.
post #33 of 79
Quote:
Originally Posted by v1ral View Post
So you guys are saying..
I can run sli 480/580's on a Corsair HX 850 watt psu no problem...watercooled and all?
This is interesting...I had the assumption that I had to get at least a 1k watt psu..
Even for SLI 470's I was thinking I would need a 1k watt psu.. will my psu be up for two GTX 470's...
v1ral
Your PSU is plenty, yes .

OP:
Your 750w will be enough if you take it lightly on the loads. Don't load up your CPU, and both GPU's to 100%, and it'd be just fine.
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post #34 of 79
Quote:
Originally Posted by jamborhgini313 View Post
If the Vcore is 1.4v+, I would definately back it down. I'm barely getting by with the 750w. I notice slow downs in SLi and that my 2nd 580 usage goes down when my PSU is going over the limit
You know the 580s have power limiters, so if you tray doing like furmark it will slow down the cards to prevent them from drawing too much power. the same thing can happen with other benchmarks.
post #35 of 79
you'd need a higher watt psu, but seriously at this point dont get 480's at this point.
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post #36 of 79
I guess the answer to this all is, with SLI 480's under ideal conditions you could problably blow up a 750, but barely, and I mean barely.

But When was the last time you were able to load up both the CPU and GPU to absolute 100% doing anything other then benching or stressing.

You also have to remember that benchmarks and Furmark are designed to take advantage of SLI, so as much of the power is used as possible. Most games aren't able to fully use SLI, so the cards may only be ultilized to 80% percent or something like that.
When you see a game that is able to load up a card that heavy, it normally isn't as hard on the CPU.
post #37 of 79
If you don't use furmark, you'll be fine. I can get through Heaven and Vantage and Crysis multiple times no problems.
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post #38 of 79
... and you would want a second 480 why?
post #39 of 79
Quote:
Originally Posted by jamborhgini313 View Post
If you don't use furmark, you'll be fine. I can get through Heaven and Vantage and Crysis multiple times no problems.
Just like I said, when was the last time you loaded to absolute 100% on both CPU and GPU when doing something other then benching or stressing.
post #40 of 79
Quote:
Originally Posted by thrasherht View Post
Oh a little fun fact for you kids.

if the PSU draws in 900 watts and is 85% efficient, that is only 765 watts inside of the case.
So you are just barely pushing over the rated limit of the PSU at 900watts.

So 750watts inside the case results in a power draw at the wall of about 882 watts with an efficiency of about 85%.
Yes I know how to do basic arithmetic, the point is those cards were not overclocked and in an open test bench, you have to admit with the over 900 number in mind it is conceivable that you will run over 750W from the PSU at peak.

Although I'm pretty sure the 750W rating of the Cosair unit is a continuous rating and it can deliver far higher amounts of power for short periods of time.

While it is true that you never load everything in your system up to 100% at the same time, but the question here is that if it is enough under all circumstances. It's the same logic that goes into wanting to have 24H stability in an overclock while an overclock that fails in the 23rd hour would probably never fail in day to day usage.
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