I would like to know if this prebuilt system is any good for gaming

[Chrispurvis32]

Motherboard name - ASROCK P67 PRO3 SE
Brand - iBUYPOWER
Model - Gamer Extreme 903i
Processor - Intel Core i7-2600K 3.4GHz
Processor Main Features - 64 bit Quad-Core Processor
Cache Per Processor - 8MB L3 Cache
Memory - 8GB DDR3-1333
Hard Drive
1TB SATA III
Optical Drive - 124X DL DVD+/-RW Drive
Graphics - AMD Radeon HD 6850 1GB Video Card
Power Supply - 700W

 

[Proximon]

Not really. It's badly unbalanced. You are spending too much on the CPU in relation to the GPU.

IF you had a 2500K in the build, with a 6950 2GB GPU, and the PSU was known and decent quality, then I would say OK.