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Will my PSU be good enough?

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November 11, 2012 2:00:14 PM

I currently have one MSi TwinFrozr iii GTX 660 Graphics card. My power supply is a Corsair TX650 (650w), in the future I may want to SLI and I was just curious if ill need to upgrade my PSU as well. I do know that two 660ti's require a 700w PSU but that card is more powerful than mine. Any help is appreciated!

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a b U Graphics card
November 11, 2012 2:18:30 PM
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a c 288 ) Power supply
a c 115 U Graphics card
November 11, 2012 2:22:01 PM

zdrfeelgoodz said:
I currently have one MSi TwinFrozr iii GTX 660 Graphics card. My power supply is a Corsair TX650 (650w), in the future I may want to SLI and I was just curious if ill need to upgrade my PSU as well. I do know that two 660ti's require a 700w PSU but that card is more powerful than mine. Any help is appreciated!


Hi - most of knowledgeable people that will respond to you on here are going to want to
know your system specs/components, so you should prob post them now.

As a general rule, the advice given here for 2 GPU's is min 750w quality PSU.

Tom
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a b ) Power supply
a c 79 U Graphics card
November 11, 2012 2:25:12 PM

toyftw said:
As a general rule, the advice given here for 2 GPU's is min 750w quality PSU.

No. Barring the most power-hungry CPUs and GPUs, 650W is usually enough. The main problem is finding a 650W PSU with enough connectors for the cards in question.
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a c 288 ) Power supply
a c 115 U Graphics card
November 11, 2012 2:33:32 PM

Sakkura said:
No. Barring the most power-hungry CPUs and GPUs, 650W is usually enough. The main problem is finding a 650W PSU with enough connectors for the cards in question.



I'm sure you are correct, that 650w is enough, but the usual advic given here for 2 GPU's is 750w
rightly or wrongly that's the usual advice(the easy way out,so to speak), I've seen it many many times.

Tom
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November 11, 2012 3:01:27 PM

zdrfeelgoodz said:
I currently have one MSi TwinFrozr iii GTX 660 Graphics card. My power supply is a Corsair TX650 (650w), in the future I may want to SLI and I was just curious if ill need to upgrade my PSU as well. I do know that two 660ti's require a 700w PSU but that card is more powerful than mine. Any help is appreciated!

PC Specs:
i5 3570k 3.4 - 3.8 GHz (May overclock in the future but right now its not necessary)/Corsair H60 liquid cooling
EVGA 131-IB-E695-KR Z75 SLI Z75 MOBO
1TB 7200 RPM Seagate HDD
MSi Twin Frozr iii GTX 660 OC Edition (running on PCI Express 3.0)
8gb 2x4GB G.SKILL Ripjaw series 1600MHz
Win7 x64
Corsair TX650 ATX12V SLI Ready
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a b ) Power supply
a b U Graphics card
November 11, 2012 3:07:12 PM

I would say that is enough because a rough estimation for that setup with sli is around 400-450 watts. That leaves lots of room for overclocking. We are also talking about the non ti 660 right? You do also have two pci-e connectors which allows you to use it on both cards.
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November 11, 2012 3:16:20 PM

socialfox said:
I would say that is enough because a rough estimation for that setup with sli is around 400-450 watts. That leaves lots of room for overclocking. We are also talking about the non ti 660 right? You do also have two pci-e connectors which allows you to use it on both cards.

Yeah its non ti. And yepp I have 2 connectors. Thanks for the input!
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November 11, 2012 3:25:05 PM

Sakkura said:
No. Barring the most power-hungry CPUs and GPUs, 650W is usually enough. The main problem is finding a 650W PSU with enough connectors for the cards in question.

SLI Ready power supply :D 
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a c 144 ) Power supply
a b U Graphics card
November 11, 2012 5:14:13 PM

A GTX660 has a 140 watt TDP. That's 10 - 12 amps max.

One of my systems has an OC'd Q9550, 4 GB RAM, a GTX260 - a card with similar power requirements to yours, a Gigabyte EP45-UD3P motherboard, 3 hard drives and an optical, and a Soundblaster card all powered by a Corsair 750TX.

Running 3 instances of Prime95 to load the CPU and 3DMark06 to load the GPU, it pulls 375 watts from the wall as measured by my Kill-a-Watt meter. Figuring 80% PSU efficiency, the system pulls 300 watts from the PSU.

Adding a second GTX660 will increase the power to 450 to no more than 500 watts. At full power, your present PSU should be operating at no more that a 70% load.
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a b ) Power supply
a c 79 U Graphics card
November 11, 2012 7:12:35 PM

toyftw said:
I'm sure you are correct, that 650w is enough, but the usual advic given here for 2 GPU's is 750w
rightly or wrongly that's the usual advice(the easy way out,so to speak), I've seen it many many times.

Tom

Yeah, it happens. People tend to overestimate the PSU requirements. Better than underestimating at least.
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November 20, 2012 1:57:57 AM

Best answer selected by zdrfeelgoodz.
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