Watt requirement for new system mystery

[PcEthuaist]

I am planning a list of components to make my new pc and I am not sure how much power the system will take. Here is the list of components:

Gpu: EVGA 01G-P3-1561-AR GeForce GTX 560 Ti FPB (Fermi)

link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130604

Cpu: Intel Core i5-2500K Sandy Bridge 3.3GHz

link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115072

Motherboard: MSI P67A-GD65 (B3)

link:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130574

Memory: either G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 or CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3

links:
G.SKILL: http://www.newegg.com/Product/Product.aspx?Item=N82E16820231314
CORSAIR: http://www.newegg.com/Product/Product.aspx?Item=N82E16820145345

Cd Drive has not been decided yet, but it will be a standard one HD is going to be 7200 RPM

Note: I might overclock my cpu in the future and will need enough power to do so. I might as well add a second Gpu since the motherboard supports double SLI. I will add another 8 gb of ram on the last two slots when I get more cash (maybe even replace all with four 8 gb cards to total 32 Gb if I win the lottery).

Please contribute if you know what amount of wattage will cover my system.

 

[Elghinnarisa]

if your going to overclock and going for SLI (or well mby going for SLI later but cuz you have those thougts it can be good to buy a psu that will support SLI right now so you wont have to buy yet a new one later)
i would go for something around 700-750 watt
560 ti SLI + slightly OC'ed cpu draws around 550 watt (in the test i read on the swedish sweclockers site) but they use a really standard system so basicly just cpu a screen and the video cards and nothing else (one hdd ofc) and not as overclocked as most ppl that do clock thier cpu use, and its always better to have a some extra watts. they do get worn out and will give you less watts every year so its good to have some over

 

[PcEthuaist]

Thanks Elghinnarisa for your contribution, You have clarified the way for me buying a proper Watted psu