Psu selection

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For a single GeForce GTX 560 Ti graphics card system NVIDIA recommends a 500 Watt or greater system power supply with a minimum +12V current rating of 30 Amps and at least two 6-pin PCI Express Supplementary Power Connectors.

For a two GeForce GTX 560 Ti graphics card 2-way SLI system NVIDIA recommends a 700 Watt or greater system power supply with a minimum +12V current rating of 45 Amps and at least four 6-pin PCI Express Supplementary Power Connectors.

Since it's the power supply's +12V current rating that primarily determines whether it is suitable for your system, both the XFX P1-650X-CAH9 650W and the CORSAIR Enthusiast Series TX750 V2 750W, that you have linked to, are both capable of handling a two GeForce GTX 560 Ti graphics...

ikyung

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Apr 17, 2010
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2x 560Ti SLI pulls about 440watts in FULL load stress tests.
i5 2500k in full load on all 4 cores overclocked is a little less then 100watts
no more then 100watts for your motherboard/RAM/HDD/SSD/DVD

So you are cutting it pretty close with a 650watt. I would opt for a 700-750watt just to be safe.
 
For a single GeForce GTX 560 Ti graphics card system NVIDIA recommends a 500 Watt or greater system power supply with a minimum +12V current rating of 30 Amps and at least two 6-pin PCI Express Supplementary Power Connectors.

For a two GeForce GTX 560 Ti graphics card 2-way SLI system NVIDIA recommends a 700 Watt or greater system power supply with a minimum +12V current rating of 45 Amps and at least four 6-pin PCI Express Supplementary Power Connectors.

Since it's the power supply's +12V current rating that primarily determines whether it is suitable for your system, both the XFX P1-650X-CAH9 650W and the CORSAIR Enthusiast Series TX750 V2 750W, that you have linked to, are both capable of handling a two GeForce GTX 560 Ti graphics card 2-way SLI system with headroom for any overclocking.
 
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