Will work fine on a 750W corsair. 200W per card + 200W for the rest of the system (OC'd i7) ~ 600W/750W ~ 80% at full system load which is fine. Corsairs are designed to handle that sort of load without issues.
Asus P8Z77-V | i7-3770K @ 4.2GHz | Scythe Mugen 2 | 2x4GB Samsung 1333 | Sapphire 7950 1100/1450 | Asus Xonar DX | OCZ Vertex 2 120GB | Samsung F4EG 2TB | WD Caviar Green 1TB | Seasonic G650 | Fractal Design Define R4 | 4x BeQuiet! ShadowWings 140mm PWM | BenQ XL2411T | Sennheiser PC350 | Logitech G710+ | Zowie AM-GS | XFX WarPad