Intel Platform Motherboard : Gigabyte GA-EX58-DS4
Processor : Intel Core i7 920
Cooler : Thermalright Ultra 120 Extreme
Memory : Corsair XMS3 6 GB (3 x 2 GB) DDR3-1600
Graphics : AMD Radeon HD 4870 X2
Storage : Samsung Spinpoint F1 1TB 7,200 RPM
Power : PC Power and Cooling 750 W
Optical : Lite-On DH-4O1S
Total cost : US$ 1.500
AMD Platform Motherboard : Asus M3A78-T
Processor : Phenom II X4 940
Cooler : Ajigo MF091
Memory : Corsair XMS2 4 GB (2 x 2 GB) DDR2-1066
Graphics : AMD Radeon HD 4870 X2
Storage : Samsung Spinpoint F1 1TB 7,200 RPM
Power : PC Power and Cooling 750 W
Optical : Lite-On DH-4O1S
Total cost $ 1.250
source