New build need some help

im building a new computer this summer
GIGABYTE GA-EP45-UD3P LGA 775 Intel P45 ATX Intel Motherboard - Retail
http://www.newegg.com/Product/Prod [...] 6813128358



http://www.newegg.com/Product/Prod [...] 6817139005
CORSAIR CMPSU-650TX 650W ATX12V



Intel Core 2 Quad Q9550 Yorkfield 2.83GHz 12MB L2 Cache LGA 775 95W Quad-Core Processor - Retail
http://www.newegg.com/Product/Prod [...] 6819115041

http://www.newegg.com/Product/Prod [...] 6835233019
XIGMATEK ACK-I7751 Retention Bracket - Retail

http://www.newegg.com/Product/Prod [...] 6835186020
ARCTIC COOLING MX-2 Thermal Compound

http://www.newegg.com/Product/Prod [...] 6835233003
XIGMATEK HDT-S1283 120mm Rifle CPU Cooler - Retail

http://www.newegg.com/Product/Prod [...] 6814161247
HIS Hightech H487F1GP Radeon HD 4870 1GB 256-bit GDDR5


i have a antec 900 case just wanna make sure everything can fit and have enough power cause im going be overclock my proc i will also have a 500gb hdd and dvd burner hook up to it

also is the volt to high for my cpu e6750 clock at 3.ghz
cpu volt 0.0125
mem volt 2.30
nb 1.35
fsb vtt volt 4%


cupz says core volt 1.352Vs