How many watts will my homebuilt pc need?

[Hollowgamer]

I am building a gaming PC and everything is going fine but i need to know how many watts it will take.
Here are the PC components:

Processor: Intel i5 2500k

Motherboard:Asus P8Z68-M PRO Intel Z68 (Socket 1155) DDR3 Motherboard

Graphics card: XFX HD-695X-CNFC Radeon HD 6950 Video Card

Ram:Kingston HyperX Genesis Grey 8GB

Hard drive:SEAGATE Barracuda 3.5" Internal Hard Drive

Solid state drive: OCZ Onyx 32GB SATA II 2.5-inch Internal Solid State Drive

I don't think this is needed but here is my case and liquid cooler.

NZXT Phantom 410 Black Case

Corsair CWCH60 Water Cooler

Also overall is this a good gaming pc.Thanks.

 

[killersquirel11]

I'd say above 650W should do ya fine. If you want to keep the possibility of throwing another 6950 in there in CrossFire, you'll want at least 900W.

For future reference, newegg has a decent calculator, seems to estimate a bit high, but that's better then erring low.

http://images10.newegg.com/BizIntell/tool/psucalc/index.html

 

[r0aringdrag0n]

You should be fine with a 600W power supply that is 80+ certified, however, if you're going to overclock or CF the gfx card, you're going to need a lot more power...from a PSU calculator, it is recommended to have 413 watts (remember that power supplies normally say they are a higher wattage than what they really are, that's why you want 80+ certification).
This is the data sheet from the PSU calc:

Spoiler

System Type: 1 physical CPU
Motherboard: Regular - Desktop
CPU Socket: Socket LGA 1155
CPU: Intel Core i5-2500K 3300 MHz Sandy Bridge
CPU Utilization (TDP): 90% TDP
RAM: 2 Sticks DDR3 SDRAM
Video Card 1: AMD Radeon HD 6950

Regular SATA: 1 HDD
DRAM SSD: 1 Drive
DVD-RW/DVD+RW Drive: 2 Drives
USB: 3 Devices
Fans
Regular: 2 Fans 120mm; 1 Fan 140mm;
Water Cooling Kit: Corsair Hydro H60
Keyboard and mouse: Yes
System Load: 90 %

Minimum PSU Wattage: 363 Watts
Recommended Wattage: 413 Watts

You can do the calculations yourself here:
http://extreme.outervision.com/PSUEngine