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Old October 6, 2012, 05:23 PM
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Location: Brisbane
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@OP

I am running 2 560ti Hawks in SLI on a Corsair HX620 PSU (check my other specs for further info). My system never draws more than 600W at the wall and is somewhere closer to 500W most of the time. My PSU is just over 80% efficient at 240V (not sure what the standard is in France) and so the actual power use is quite a bit lower. At 822Mhz you will have no problem as my cards come factory overclocked at 950Mhz. Not to mention that Be Quiet! are a great brand and I would trust them to deliver their stated wattage.

To answer your other question: Once you have bought another card, test each one to see which has the better cooling and place the better one on top. If you use your current card on top it is likely that it will reach 80C without extra cooling (case fans etc) but that is well within spec.

Also, be aware of Vram limitations. At your resolution you shouldn't have that issue, but it's something to consider if you are going to upgrade your monitor.
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Old October 6, 2012, 08:31 PM
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My System Specs

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The GTX-560 TI draws around 210 watts and a little more when overclocked.Probbally around 460watts for both of them and your powersupply should be plenty.
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gtx 560 ti sli , psu , question

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