Building a Bitcoin Miner

Output: 1624MH/s using 4 Gigabyte HD 5870 UD Cards @ 900MHz/302MHz

Chassi: Antec LanBoy Air Midi Tower
Motherboard: MSI 980FXA-GD70, Socket-AM3
CPU: AMD Athlon II X2 250
PSU: Corsair AX 1200W (best PSU ever)
RAM: Corsair Vengeance DDR3 1600MHz 2x2GB CL9
GPU: Gigabyte HD5870 UD (overclocked to 900MHz, mem downclocked to 302MHz)

Music: Chasing Shadows – The End

Most important part of a Bitcoin miner is using the right software and keep tuning it to find the right balance between performance, power usage and temperature.