Are these parts compatible with eachother?

[milopeach]

Hey all, this is my first time building my own PC for gaming, and I'm just wondering if the parts I've chosen are all compatible with eachother. I looked around and I'm pretty sure that they are, but id just like some confirmation to know for sure The main reason for this PC is gaming.

CPU - Intel Core i5 2500K
Motherboard - Gigabyte GA-Z68X-UD3H-B3 Motherboard
Graphics Card - Sapphire Radeon HD6970 2GB
RAM - G.Skill Ripjaws X F3-12800CL9Q-16GBXL (4x4GB) DDR3
Hard Drive - Western Digital Caviar Black 1TB WD1002FAEX
Case - Lian Li Lancool First Knight PC-K63
PSU - OCZ Fatal1ty Series 750W Modular

 

[Why_Me]

Ya it all works together but what's with the 16GB of RAM? Is this a professional video editing build? And you can do better than that Fatality psu.