[Solved] Cant raise memory clock of msi 6850 oc pe when overclocking

hey.
so yesterday i decided to try and overclock my msi 6850 oc pe using afterburner.
i installed afterburned and stared raising the core clock from the defaul 860 and up without adjusting the voltage. i got to 965 (i used kombustor to check for stability and after 90 minutes of stress test the 965 value proved to be quite stable)
next i tried to raise the memory clock. i raised it from the default 1100 to 1110 and run kombustor. the card crashed after 10 minutes. i lowered it to 1105 and the program crashed after 15 minutes. why?
on other various overcloclocking reviews of the msi 6850 oc pe people had various results in overclockign the card (obviously) but everyone managed to raise the memory clock to AT LEAST 1125 (im talking bout the minimum while some were able to get 1200 but WITH voltage tuning). the 965 mhz value i got out of the core clock seems to be the average if not a TAD above average when compared to other ppl, while not having to adjust the voltage.
so how come i can raise the core clock easy enogh without adjusting voltage, and not the memory?

*also when i say that the card crashed i mean that the kombustor screen just went black and froze up so i had to END TASK the thing. i didnt get the "display driver crashed and recovered" alert,. when kombustor's screen goes black that DOES mean that the card crashed right?

I always recommend OCing the memory first. You can't adjust memory voltage so it's good to find the highest mem speed first. Even though the voltage can't be adjusted, there does seem to be some link between the core and memory, so basically in theory a lower core clock will probably get you a higher memory clock.

Other than that, though, just means you got unlucky with the card.

Nah, adjusting the voltage is only going to produce more heat and shorten the life of your card. Try 900/1150 - that's about as high as any 6850 should get on stock voltage. Check out this overclocking review:

http://www.anandtech.com/show/4002 [...] -xfx-msi/8

With the HD 6850, the biggest boost comes from OCing the memory.

ok anandtech is back online. just saw the review and its quite interesting. i saw that at least in their tests a 940/1150 is only, like, ONE frame faster than 960/1150. but this review is about the msi 6850 oc. i have the msi oc PE which has a higher stock clock of 860 mhz.
but anyway i will try lowering the core clock and see if that enables me to up the memory. if you have some advice it will be appreciated.
also would like to hear some more OC results from ppl who have this card.