Rate my system + Advise on ram needed

[sidmo001]

Hi there all,

I recently upgraded my MB and PCU and I would like some ratings on it from the gaming community.

Motherboard: SABERTOOTH 990FX
Processor: AMD FX(tm)-8120 Eight-Core Processor 3.1MHz
Video Card: Radeon HD 6950 1024MB
Memory: Corsair DDR3 4096MB
Power Supply: Corsair 850W

I'm looking to upgrade my RAM, but I'm not sure what a good type of ram would be for my current set up.

Suggestions?