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1200W Sufficient or Overkill

post #1 of 12
9/17/12 at 1:13pm
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I was about to place an order for a "Cooler Master Silent Pro Gold 1200 W PC Power Supply" for the rig I am about to build which can be seen under my 'rig' below.

The recommended minimum power supply is 700Watts (based on ASUS Power Supply Wattage Calculator). I plan to purchase another Nvida GeForce GTx 660 Ti msi in the future which will bring the recommended minimum power supply to 1000 W.

Will the excess 500 w before upgrade make my system unstable or likely to cause damage? Excess wattage once I am running dual Nvida GeForce GTx 660 Ti msi on SLI will only be 200 W, which I assume will cause no issues.

I have read mixed reviews so advice is need and appreciated.

Thanks!
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post #2 of 12
9/17/12 at 1:15pm
Waaaaaaaaaaay overkill. A 750W will do fine.
Edited by driftingforlife - 9/17/12 at 1:17pm
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post #3 of 12
9/17/12 at 1:17pm
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Get a quality 850W unit and be done with it.

Also, why the GTX660? It performs worse and is more expensive than the HD7950.
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post #4 of 12
9/17/12 at 1:19pm
A 650W would suffice for 2 660Ti's. Yes it will. I would get a 750W for a bit of future head room just in case.
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post #5 of 12
9/17/12 at 1:19pm
From the sounds of it you want to be able to run 2 660 ti's in SLI. If so, 1200W is complete overkill; although this is OCN so there's nothing wrong with that biggrin.gif

But no, it won't hurt your system to utilize only a portion of your total available wattage. However, you don't need to buy that powerful of a psu. I can run 2 overclocked 580's with my heavily overclocked cpu on only 850 watts, so there's no way you need that much power just for two 660 ti's.

Try using this calculator and plan for a little extra headroom. You'd probably be more than well off with a 700W power supply
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post #6 of 12
9/17/12 at 1:25pm
i think at this point 1200w would only really be needed for quad gpu setups or something really exotic.

That said, it wont hurt anything OP. But as others said a 650/750 would be fine
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post #7 of 12
9/17/12 at 1:33pm
You're talking about two ~150W cards.... a 1.2KW PSU would be overkill even for 4 (four) 660Ti cards.
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post #8 of 12
9/17/12 at 1:43pm
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1200w is way overkill unless you do like 2 690s.

Why do I have one? I had the money to burn.

750w is perfect for dual GPU setups.
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post #9 of 12
9/17/12 at 1:47pm
1200 is totally an Overkill like others said. Get a good 750w or 850w PSU and that will be Fine.
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post #10 of 12
9/17/12 at 2:38pm
Even the 750-850 watt recommendations are complete overkill with modern components, we're talking 660 Ti's, not 480's. Even a quality 550 watt PSU would be fine including overclocks; 650 watts if you were to do dual 680's.
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