Originally Posted by PureDorian
I overclocloked HD 5970 to 850mhz core, it's stable, temps are fine, i added voltages, it's now 1.162V
But when i am trying to overclock memory to 1200 the system seems to be unstable(artefacts) but the temps was fine, what's wrong?
I already posted more info on another thread
You have to test and run in CCC before applying the overclocks. 1.162 is the max you can use and I dont thing its needed for 850Mhz. 1.125 should be fine but that still depends on your specific card.
Regarding the memory freq. of the 5970, still it depends on the specific card and also in the timinings your Card memory has. Tight timings allow less overclock but still provide good performance results.
Try starting from 1.125 850/1100 and continue increasing the memory frequency (and voltage only if needed!) until you get what you want and your card can supply. If you come across lock-ups with the memory increase, then pump up just a little the voltage and try again.
Note: in redline you will see also memory voltage increase slider... I haven't tried using that and I am not sure that it works for the 5970 series. Still I would not use it (personal opinion)
CCC can help you on the overclock by pressing the test button of new clocks in the Overdrive section (vertical bars in full screen/esc to exit/check result pass fail).
to have loaded the overvolt tool and APPLY 1.125v core voltage before
any overclock attempt and also to apply same overclock in BOTH
cores-not only one. (In MSI AB I could overclock only one core)
Special note.... ALL the time make sure that your card stays cool with the appropriate fan setting!!! (Use GPU-Z in background if needed) I managed yesterday to get 940/1250 with 1.1625 but stable I was only with 930/1250. Temperatures I had during these checks were (75% fan) 69C max cores, 82C max VRMs... I do not like any temps higher than that.