Hi im new one.

Just bought Club3D HD4870 Overclocked Edition week ago cuz of the Zerotherm Cooler on it. Card is quite cooler than with stock cooler.
GPU OC is fine 860Mhz...but this card memory seems to be bad cant oc over 1050Mhz (getting artifacts in 3Dmark06)...but HD4870 stock cards can get 1200Mhz...both should be Qimonda chips memory...so whats the problem can be that HD4870 stock getting better memory OC than HD4870 with Zerotherm coooler? Does anyone know something about that??