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Advice needed- can my Antec 750 handle dual 580's?

post #1 of 10
Thread Starter 
I am hoping to add a 2nd 580 to my rig but I am not sure if my PSU could handle dual 580's? How accurate is the power calculator and how much wiggle room is there? My psu is the Antec EarthWatts EA750 750W and have no problems with it running my first build... with an oc'd X6 1090 and gtx 580.... Would I be pushing the psu to much if I ran everything at stock clocks? If I have to upgrade my psu I probably will have to hold off on adding a 2nd 580 for now.....

Appreacite any advice/input....

Thank you
    
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post #2 of 10
Yes.
post #3 of 10
Quote:
Originally Posted by Phaedrus2129 View Post
Yes.
Your official PSU calculator begs to differ, it says 775W.

But your PSU should work, I am not sure on how much Overclocking you will be able to do though.
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post #4 of 10
Quote:
Originally Posted by Ironman517 View Post
Your official PSU calculator begs to differ, it says 775W.

But your PSU should work, I am not sure on how much Overclocking you will be able to do though.
Just ran his rig and it says 775W, which puts 750W units within the margin of error. He's fine.
post #5 of 10
You will be perfectly fine. Only when you start overvolting the gtx580's can it become a problem. My sig rigs psu will restart the computer if I push my gtx480 volts past 1.08mv
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post
Just ran his rig and it says 775W, which puts 750W units within the margin of error. He's fine.

Thanks, I ran the power calculator and was aware that it was a little high but wasn't sure how much of a buffer there would be with a 750psu.. or wiggle room if I run everything at stock speeds for now with the 2nd 580 added... Ill eventually upgrade to a 950 or 1000 but was offered the 580 at a cant pass up price and just wanted to know how feasible it was to expect a 750psu to run them both considering what the power calc determined......

thx
    
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post #7 of 10
750W is more than fine. You'll never break 650-700W load, unless you start increasing core voltage like mad, and on average you'll see more like 500-600W load.
post #8 of 10
I have a Corsair TX750W PSU. I can load my CPU, 570, and 1 260 all running BOINC apps and just barely draw under 600W at the UPS. I'm strictly guessing that my PSU has 80% efficiency, so the 600W is actually ~480W from the PSU. That's still almost another 300W left until you hit the maximum power the PSU can supply. Your 750W PSU will handle those 580s just fine.
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post #9 of 10
I ran a i7 920 @4. 4 with two 295s with a tx750. Folded on all components.

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post #10 of 10
It is enough.

Guru3D.com was able to get their test system to pull 719W from the wall when it had two 580s in it under full load (source). If I assume that their PSU was 85% efficient during this power draw, then that would mean their system pulled about 611-612W from the PSU (611.15W). However, Guru3D also recommends adding about 100 to 150W in order to account for the rest of the system which brings the absolute maximum to approximately 710W to 760W.

The 750W Earthwatts is capable of continuously delivering 750W, so it is enough for it.
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