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PSU for 580 gtx

Last response: in Components
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May 29, 2011 6:59:05 PM

I am about to buy a 580 gtx but dont know if my 600W psu will be enough. Probably not since the min req for this card is 600W.
Anyways, i was wondering how do i find out which psu i will need?
Here are my specs:
i7 950 3.7
6 gb RAM
i hdd and i cd/dvd drive
about to buy 580 gtx (this one is the 3 gb one)
I have 4 or 5 usb spots that are being used.
Hopefully thats enough if anyone needs to ask more questions id be happy to answer them!
Thanks guys

More about : psu 580 gtx

a b ) Power supply
May 29, 2011 7:05:33 PM

no, i think not, I think you will need a 750w psu for that cool rig of yours.My gtx580 goes on a corsair 700w.So you should give us your intended budget for such a cool gpu.
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May 29, 2011 7:51:25 PM

holy heck this upgrade is costing me arm and leg lol. Well i found one for $120 bucks and its a 800W Corsair one.
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a b ) Power supply
May 29, 2011 7:54:35 PM

well it should.But with expensive hardware i think you would really need a quality psu.A corsair 800w should be great.
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a b ) Power supply
May 29, 2011 7:55:00 PM

what specific 600 watt psu
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a b ) Power supply
May 29, 2011 7:59:23 PM

bigdaddycoop said:
holy heck this upgrade is costing me arm and leg lol. Well i found one for $120 bucks and its a 800W Corsair one.

Quote:
GeForce GTX 580

On your average system the card requires you to have a 650 Watt power supply unit.
GeForce GTX 580 in SLI

A second card requires you to add another 250 Watts. You need a 900+ Watt power supply unit if you use it in a high-end system (1 KiloWatt recommended if you plan on any overclocking).
http://www.guru3d.com/article/geforce-gtx-580-review/7


I think you would be able to go for a 700w one.
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May 29, 2011 9:27:39 PM

Note: each of the 2 Rails is 38AMps.
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May 29, 2011 9:33:45 PM

thats a 650 one man i prob should go for atleast 700W
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May 29, 2011 9:40:57 PM

No need, Let's say a GTX 580 will get a max of 75w from Mobo, another 150w from the 8 pin, let's say another 180w at most from CPU, and peripherals. That worst case scenario 75+150+180= 305 Watts from one rail 305W/12V = 25Amps seems like plenty, Event if you say 400W from one Rail 400/12 = 33.3 Amps out of 38Amps, It is just too much for cheap. Does it make sense?
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May 29, 2011 10:09:39 PM

im running dual 570's in SLI overclocked on a corsair 750W PSU - a branded 600w should actually cover a single GTX580

PSU calculator anyone?
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May 29, 2011 10:31:12 PM

Yes but that Antec EA 650 is cheap and Good. Why not?
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a b ) Power supply
May 29, 2011 10:48:54 PM

XFX 750W Black Edition Modular Power Supply
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May 30, 2011 3:02:02 AM

wow thanks guys...theres quite a bit of selection to choose from. After this upgrade i dont think im going to upgrade for atleast 2-3 years
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a b ) Power supply
May 30, 2011 7:20:11 AM

bigdaddycoop said:
wow thanks guys...theres quite a bit of selection to choose from. After this upgrade i dont think im going to upgrade for atleast 2-3 years

If you could you can go for a 850w psu.I think it maybe able to run gtx 580 on sli.R
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a b ) Power supply
May 30, 2011 7:20:11 AM

bigdaddycoop said:
wow thanks guys...theres quite a bit of selection to choose from. After this upgrade i dont think im going to upgrade for atleast 2-3 years

If you could you can go for a 850w psu.I think it maybe able to run gtx 580 on sli.R
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a c 1168 ) Power supply
May 30, 2011 6:28:56 PM

cronos177 said:
Note: each of the 2 Rails is 38AMps.

+12V1, +12V2 Maximum combined output: 650W (54.2 Amps)

Not quite the 76 Amps you imply.

If you draw 38 Amps on one of the +12V rails you can only draw 16 Amps from the other +12V rail.
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a c 1168 ) Power supply
May 30, 2011 6:38:58 PM

For a single GeForce GTX 580 card system you should be using a power supply with a combined +12 Volt current rating of 42 Amps or greater. If your current 600 Watt power supply unit meets this specification requirement you will be fine. The power supply should also have at least one 6-pin and one 8-pin PCI Express Supplementary power connector.

Two GeForce GTX 580 in SLI mode would require a power supply with a combined +12 Volt current rating of 62 Amps or greater.
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a b ) Power supply
May 30, 2011 7:06:20 PM

Just to give you a point of reference, I have a 950TX 80-plus power supply (much more than I need). When I max out gaming with 2 580s in SLI, my measured draw from the outlet (using an appliance load tester) has never exceeded 780W. This is while each GPU was in the high 90%s GPU load as measured by GPUz during gaming.

So let's say, as a worst case scenario, my PSU was operating at exactly 80% efficiency at that load:

780W * .8 = 624W required by my system with 2 GTX 580s almost maxed out. This is with 8 threads working on the CPU while playing BFBC2.

The OC on your CPU increases your power draw on the 12V rail (normal non-OC'd requirement is 10-12.5 Amps), so you have to take that into consideration. The OC could require anywhere up to 8 additional Amps. I would say you'd be OK with a 600W CPU if the 12V rail offered up around 240W (20A) for the CPU and another 240 (20A) for the video card. On top of that, any system fans will draw from the 12V rail as well.

The supply I'd recommend would give a little more than you need on the 12V rail, account for the CPU OC and provide a reliable power solution for years (5-yr warranty):

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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May 30, 2011 8:03:03 PM

^ That's a good PSU, reasonable priced too.
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