My pc spec :

AMD Phenom 940, 3.0GHz
Coolermaster Power Supply 850W.
Gigabyte 9800GTX+
Xigmatek Processor Cooling
Asus M4A78-E Mobo

Just need to get some advise...what ram is really fit for my pc? i want oc my pc and also want to have a ram 1200MHz...just don't know which type of ram is suit..

OCZ Reaper & Corsair Dominator...which one is the best??