so for a build of:
Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - Retail
MSI ATI Radeon HD 6950 OC Twin FrozR III Power Edition 2048MB GDDR5 PCI-Express Graphics Cardx2
MSI Z68A-GD65-G3 Intel Z68 (Socket 1155) DDR3 Motherboard
Corsair Graphite 600T Midi Tower Case - Limited Edition White
LG BH10LS38 10x BluRay-RW / 16 x DVD±RW Lightscribe Drive - Black (Retail)
Antec Kúhler H2O 620 CPU Watercooler (Socket Intel LGA 775 / 1155 / 1156 / 1366 / AMD AM2 / AM3 / AM2+ / AM3+)
Kingston HyperX Genesis Grey 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit (KHX1600C9D3X2K2/8GX)
the 750 would run it no prob?