Will these be a good build?

[deadbart]

Acer V223HQVb 21.5 inch Widescreen LCD Monitor - Black (VGA, 1920 x 1080,
Corsair CMPSU-600CXV2UK Builder Series 600W Power Supply
Sapphire 11200-00-20G HD7850 2GB GDDR5 Graphics Card
Antec Three Hundred Two Midi Tower Case - ATX, M-ATX, M-ITX, 2 x USB 3.0
Cooler Master Hyper 212 Evo CPU-Kühler (120mm)
Corsair CMZ8GX3M2A1600C9B 8GB 1600Mhz CL9 DDR3 Vengeance Memory Module Kit
Western Digital Caviar Blue 500GB SATAIII 6Gb/s 16MB Cache 3.5 inch Internal Hard Drive OEM
Sony AD-7261S-0B 24x Internal DVDRWRAM SATA Black Lightscribe
AsRock Z68 Pro3 Gen3 Motherboard (Socket 1155, DDR3, PCI Express 3.0, 7.1 HD Audio, ATX, ASRock On/Off Play Technology)
Intel Sandybridge i5-2500K Unlocked Core i5 Quad-Core Processor (3.30GHz, 6MB Cache, Socket 1155)

if you could let me know how it would run games, i would appreciate it

 

[rein001]

i would go for new z 77 boards

 

[deadbart]

z77 pro 4 good enough?

 

[l0v3rboi]

There is no point for the new z77 boards since you are using a Sandy Bridge processor. Keep the one you have. In terms of gaming, it will either match or do slightly better than the previous generation gtx 580.