XFX HD 5850 Graphic Card Problems!

[big320488]

Hello everyone I been scrolling the forums tring to figure out what my problem is I, My XFX Radeon HD5850 Black edition card is causing problems. when i try to play a simple game like CSS after a few minutes i get a flicking and the screen turns into gray or brown vertical lines and most of the time freezes my PC, I tried adjusting down my GPU clock settings & memory clock settings. I jut downloaded and installed the latest AMD catalyst 11.7 and not sure what teh hell is going on!! any one have any ideas??? Plz help

My system is:

win 7 x64
Asus crosshair IV formula
AMD phenom II x6 1090T
cp-850 Antec 850W power supply
XFX Radeon HD 5850 (part # hd-585x-zabc)
2 sticks of G.Skill DDR3-1600 PC3-12800 2gb

 

[big320488]

Ok so since i have a Asus MB and have a 6-core AMDS processor am i running the wrong memory??? look at this Asus PDF i just found.

http://dlcdnet.asus.com/pub/ASUS/mb/socketAM3/Crosshair_IV_Formula/C4F_Memory_QVLwith6coreCPU.pdf

Would this cause my system and graphic card to not sync with the memory controller in my CPU

My memory is F3-12800CL9D-4GBRL
DDR3-1600 PC3-12800
2048MBx2
CL9-9-9-24 1.5v