hd 5970 overclocking question

[davegl1234`]

Hi, I thought I would have a look at a overclocking my 5970, and limited myself to a 1.125 voltage for now. I was aiming for around 850 core, and to see how high i could get the memory.


I am able to overclock the core alone to 870 before i decided to look at the memory, and then, with the core reset, was able to get the memory to 1200 before i thought i'd look into how overclocking both at the same time would fare.


I was always under the impression that a stable core plus a stable memory would be roughly stable when together, but with the memory at 1200 and then the core just at 750 it would lockup almost immediately when starting a furmark.


I am new at overclocking graphics cards, and have only overclocked one other, so was just looking for an explanation for this big difference in stability.....Do I also need to raise the memory voltage to overclock both? In that case would the memory temperature be the 3 'other' gpu temps listed in GPU-Z listed before the VDDC phase temps?

Nice one

i7 920 @ 3.8
6GB Corsair RAM
Asus P6td deluxe
Corsair 750TX (could this be an issue?)

 

[Tripp17]

I would say to u that not all cards are made equal when OCing. My 5970 gets to 810 core and 1120 mem without adding any voltage. I have gotten my card to 900core and 1300 mem with the voltage adjustments, but it sucks way to much poer for me to leave it that way and i have to keep the fan speed at at least 40% when its that high and i hate loud comps. I keep mine for 24/7 opperation at 790 core and 1100 memory with no added voltage. Like i said, there r never garntees with over clocking.

 

[AlvinMaker]

Good point.

My Diamond 5970, for example, can't hit ANYTHING over stock without added voltage. It locks up immediately.

Bumping my voltage ,however, I am stable at 900/1050.