How big of a power supply do you really need?

gamerx456

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I'm building a cheap gaming rig for around $700, and I'm gonna be running a HIS Radeon HD 6850 and an AMD phenom x2 black edition 555 dual core that will unlock to 3-4 cores. What's the best way to determine how big of a power supply I need? Like I said I'm on a budget, and I'll downgrade the power supply wattage to downgrade the price :sol:
Is the amount of power needed by a power supply determined by the required wattage of the GFX card combined with the required wattage of the processor? Thanks
 
How about this for 700$ -

Asrock 870 Extreme3
www.newegg.com/Product/Product.aspx?Item=N82E16813157198

AMD Phenom II X4 955
www.newegg.com/Product/Product.aspx?Item=N82E16819103808

2 x 2GB DDR 1333 MHz RAM
www.newegg.com/Product/Product.aspx?Item=N82E16820231275

Radeon HD 6850 1GB Video Card
www.m.newegg.com/Product/Product.aspx?Item=N82E16814150516

Samsung SpinPoint F3 1TB Hard Drive
www.newegg.com/Product/Product.aspx?Item=N82E16822152185

Asus DVD Writer
www.newegg.com/Product/Product.aspx?Item=N82E16827135204

Antec 300 Illusion
www.newegg.com/Product/Product.aspx?Item=N82E16811129066

Antec 750W PSU
www.newegg.com/Product/Product.aspx?Item=N82E16817371025
 
How about this for 700$ -

Asrock 870 Extreme3
www.newegg.com/Product/Product.aspx?Item=N82E16813157198

AMD Phenom II X4 955
www.newegg.com/Product/Product.aspx?Item=N82E16819103808

2 x 2GB DDR 1333 MHz RAM
www.newegg.com/Product/Product.aspx?Item=N82E16820231275

Radeon HD 6850 1GB Video Card
www.m.newegg.com/Product/Product.aspx?Item=N82E16814150516

Samsung SpinPoint F3 1TB Hard Drive
www.newegg.com/Product/Product.aspx?Item=N82E16822152185

Asus DVD Writer
www.newegg.com/Product/Product.aspx?Item=N82E16827135204

Antec 300 Illusion
www.newegg.com/Product/Product.aspx?Item=N82E16811129066

Antec 750W PSU
www.newegg.com/Product/Product.aspx?Item=N82E16817371025
 

jockey

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I'd recommend getting a 600W PSU simply because of your plans to unlock the 555. It will automatically want more power, and I feel that playing it safe with a higher wattage PSU would be a benefit for you. Plus the upgrade factor down the road.
 

gamerx456

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That benchmark testing really helped :)
 

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