Currently my computer is:
CPU:Intel Core i7 Extreme Edition 965 Nehalem 3.2GHz LGA 1366 130W Quad-Core Processor Model BX80601965 - Retail
Heatsink/Fan:Noctua NH-U12P SE1366 CPU Heat Sink (Socket LGA 1366)
MB:ASUS P6T Deluxe LGA 1366 Intel X58 ATX Intel Motherboard
GPU:ASUS EAH4870X2/HTDI/2G Radeon HD 4870 X2 2GB 512-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
^That's a single GPU card
PowerSuppy: PC Power & Cooling Silencer PPCS750QBL 750W ATX12V / EPS12V SLI Certified
^That PSUs actually capable of more than 750W. Just for the +12,+5,+3.3 rails, it can deliver a peak power of ~950W. (Calculated using formula W=V*A)