Hello, i'm building my own gaming PC. List of the parts: Processor: AMD Phenom II X4 955 Black Edition VGA: AMD Radeon Sapphire HD 5850 1024MB RAM Memory: DDR3 16GB (2x 8GB) 1600MHz Motherboard: Gigabyte 970a-d3 AM3 Psu: PowerX3 Pro Edition 800W Psu Hard drive: WD HDD SATA 500GB 7200RPM...