Good gaming build?

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor
Cpu Cooler: Cooler Master Hyper 212 EVO
Motherboard: ASRock Z77 Pro4 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX
Memory: G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600
Storage: Western Digital Scorpio Black 500GB 2.5" 7200RPM Internal Hard Drive
Video Card: HIS Radeon HD 7850 2GB Video Card
Case: Rosewill Blackbone Black Steel / Plastic ATX Mid Tower Computer Case
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supp
Optical Drive: ASUS 24X DVD Burner
Operating System: Win7 64bit

Is this build compatible? Ive already ordered the case, ram, and optical drive. So I can change anything but those parts I ordered.