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HD5770 sapphire vapor-x OC problem

post #1 of 6
Thread Starter 
Hi all,

Waiting for the next gen gfx card, I am trying to OC my 5770 (no voltage tweak possible) and I think I have been really unlucky: the max GPU/Ram freq I can get is 950/1280.

At this freq it is VERY stable: no artifact, max temp 63°C. But if I add 5 MHz (GPU or Ram), it freezes and I need to reboot...

Any clue?
post #2 of 6
100mhz on the core isn't bad without a voltage increase, my 5870 will only go from 850 to 965 on stock volts. Memory seems to vary a lot from card to card as far as oc's go. 80mhz does seem like a less than normal bump though. Lowering to core to 900 and the memory may be able to run at 1300 (ccc max), this would allow you to operate inside the ccc oc bug (wont lower idle speeds if above ccc max). If you still want to oc more, check out pencil modding for your specific card.
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Robit
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post #3 of 6
Thread Starter 
Thanks Vap0r87,

Is it better to upper the memory and lowering the core?

EDIT: what I find strange, is that there is no step between perfect stability and freeze...
Edited by skmanu - 1/31/11 at 3:02pm
post #4 of 6
I've always found that oc'ing the core more than the memory gave slightly better results in benchmarks, not sure about gaming. Whenever I oc a card I max out my core, then get the maximum memory clock.
Robit
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Robit
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post #5 of 6
do you have the blue or black pcb? the black version will oc good and you can adjust voltage, the blue doesn't oc well and no voltage control. sometimes the memory doesn't oc well on these cards too. you may want to check this http://www.overclock.net/ati/633816-...r-ati-gpu.html if you haven't modified afterburner yet.
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shoebox
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post #6 of 6
Thread Starter 
I have the blue version...

So, I think that's where I'll stay...

Gonna focus on my W/C loop again!
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