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750 Watts enough for 580 SLI?

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  • Graphics Cards
  • Gtx
  • SLI
  • Graphics
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Last response: in Graphics & Displays
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March 31, 2011 3:03:16 AM

I currently am thinking about going with 2 GTX 580's in SLI since the 590 is sold out. I was wondering if a 750 watt supply was enough to run 2 gtx 580's in SLI?

More about : 750 watts 580 sli

a c 675 U Graphics card
March 31, 2011 5:04:49 AM

That's one of the best PSU's, but you will be right at the minimum limit. It will depend also on the rest of your system components, but overall, I think you will be fine if you don't overclock. Overlocking won't be necessary with a pair of 580's anyway.
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a c 124 U Graphics card
March 31, 2011 5:26:14 AM

I have a Corsair 750TX as well. Running two 5850s. According to the calculator things it recommends for me around 700W... and 580s are significantly more demanding.

Will it work? Yes, I think so. But I also think it will highly tax the PSU. I would say in the short term if you really want/need that much GPU power go for it, but you should consider upgrading the PSU since you're already looking at over a grand in GPUs, and just sell your current one if you can.
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March 31, 2011 5:32:00 AM

Well these are going to be my specs.

Case : COOLER MASTER HAF 922 BLUE
PSU : Corsair CMPSU-750TX 750W
MB : Asus Rampage III Formula
CPU : Intel Core i7-950 Bloomfield 3.06GHz
HD : Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM SATA 6.0Gb/s
GPU : EVGA GeForce GTX 580 x 2
Optical Drive: LITE-ON Black 12X Blu-ray Burner with Blu-ray 3D feature
Memory : G.SKILL Ripjaws Series 12GB (3 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600
OS : Microsoft Windows 7 Home Premium 64-bit

I mean....I'm not going to overclock. I was really planning on going with one gtx 590 but it is sold out everywhere. So now I'm thinking 580 SLI.
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a c 124 U Graphics card
March 31, 2011 2:56:28 PM

What about maybe 570 SLI?

A quick PSU calculation dropped your requirements from 717W to 669W* going from 580SLI to 570SLI. And the 570s should be at least as fast as the 590.

*793W with 20% cap ageing (recommended if using PSU for more than 1yr)
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a c 208 U Graphics card
March 31, 2011 3:40:57 PM

The 750TX will handle it fine, but you wont want to OC them much if at all as you will start pushing the limits.


@wolfram, capacitor aging on the calculators is grossly overestimated, a 105C capacitor running at 80C for 3 years will still be at about 90% of its capacity so 20% would take over a decade for a good cap.
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a c 124 U Graphics card
March 31, 2011 4:03:00 PM

Fair enough but then,
http://guru3d.com/article/geforce-gtx-580-sli-review/14

SLI 580: 719W at the wall. Without the CPU OC it would save a little bit but really... 750W isn't offering much room.

http://guru3d.com/article/geforce-gtx-570-sli-review/13
SLI 570: 578W

I'm sure 580s will run, but IMO it's just too close. When spending over $1000 on GPUs, it doesn't make sense to not just spend the extra $30 for the 850TX or the extra $40 for the 950TX
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a c 675 U Graphics card
March 31, 2011 6:03:48 PM

wolfram23 said:
Fair enough but then,
http://guru3d.com/article/geforce-gtx-580-sli-review/14

SLI 580: 719W at the wall. Without the CPU OC it would save a little bit but really... 750W isn't offering much room.

http://guru3d.com/article/geforce-gtx-570-sli-review/13
SLI 570: 578W

I'm sure 580s will run, but IMO it's just too close. When spending over $1000 on GPUs, it doesn't make sense to not just spend the extra $30 for the 850TX or the extra $40 for the 950TX

Guru3d is careful to point out that their test system is "power hungry", with an overclocked processor and energy saving features turned off. The thing I am banking on is that the Corsair TX and HX series are easily capable of delivering more power than their rated wattage.

With the listed system specs, there really is no reason for slayinsoulja to overclock. I don't overclock my i7 processor because it disables the Turboboost function, which OC's the CPU automatically up to 3.7 ghz as needed. For the i7-950, Turboboost should hit even higher speeds.
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a c 208 U Graphics card
March 31, 2011 8:55:03 PM

They also state that it is at the wall, assuming 85% efficiency(higher than likely) that puts the DC draw at 719*.85=611.1W, which isnt too close to the limit of the 750TXs capacity
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