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is my rig enough for GTX480 SLI? - Page 3

post #21 of 79
Quote:
Originally Posted by TickleMeElmo View Post
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, 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
Dude, really now? They measure the load at the wall. So that means that 600 watt reading includes every single piece of hardware in the computer. Plus the fact that the PSU is only putting out like 85% of that 600watts.
post #22 of 79
Quote:
Originally Posted by thrasherht View Post
Dude, really now? They measure the load at the wall. So that means that 600 watt reading includes every single piece of hardware in the computer. Plus the fact that the PSU is only putting out like 85% of that 600watts.
Yes but that doesn't include the overhead that's included with overclocking, mutiple hard drives, fans, a pump etc. Also read that article they state it goes over 900 at certain times, I don't know what situations but I trust HardOCP's journalistic integrity.
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post #23 of 79
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%.
post #24 of 79
Quote:
Originally Posted by thrasherht View Post
Dude, really now? They measure the load at the wall. So that means that 600 watt reading includes every single piece of hardware in the computer. Plus the fact that the PSU is only putting out like 85% of that 600watts.
You do also realize that the 600w reading that they're getting is NOT a FULL SYSTEM load either, right?

For an overclocked i7 + GTX480 SLI you need an 850w unit. Period. Could you get by with 750w? Absolutely. But don't stress the system fully, or you will overdraw the 750w unit, I promise that.
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post #25 of 79
Quote:
Originally Posted by pioneerisloud View Post
You do also realize that the 600w reading that they're getting is NOT a FULL SYSTEM load either, right?

For an overclocked i7 + GTX480 SLI you need an 850w unit. Period. Could you get by with 750w? Absolutely. But don't stress the system fully, or you will overdraw the 750w unit, I promise that.
*dies*. Fine you guys go buy oversized PSUs.

have fun.

just so you know they used a 87% efficient supply, so that comes to 522 watts inside the case of draw. So they have an extra 228 watts to go before hitting 750watts of draw inside the case.
post #26 of 79
Thread Starter 
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
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post #27 of 79
PSU's aren't all watts, what about amp's the 12v rail?
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post #28 of 79
Quote:
Originally Posted by Johnny Guitar View Post
PSU's aren't all watts, what about amp's the 12v rail?
Yes, but generally the 12v rail can handle almost the entire rated wattage of the PSU on a quality PSU.
post #29 of 79
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...
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post #30 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
Water cooling doesn't really add much as far as power draw, the highest end pumps only draw like 20 watts.

Yes an 850 will run dual 480s with ease. The 470 will be a walk in the park for it.

1kw PSU's are only needed when looking at 3way and 4way SLI.
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