MSI 7950 boost edition- Core and memory clock going up and down

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Hey guys,

I was wondering if any of you could shine a light on this strange problem I'm having? Yesterday my new MSI 7950 Twin Frozr boost edition (960MHz/1250MHz) arrived from Overclockers UK, fitted it in no problems, noticed an immediate difference in games Curiosity got the best of me though so i decided to oc it to 1150/1500 just to see if it would be stable and run cool and what not.

I decided to run unigine heaven for a benchmark and for some reason during this benchmark the core clock and memory clock kept going up and down by 3-400 MHz then going back up to the oc'ed speed i had set, how come? I re-ran unigine 2-3 times and same again. In bf3 though it didn't drop from the quick 10 mins i tested. At stock speeds i don't think it jumped up and down at all. My card oc'ed or not never went past 55c during the benchmark.

Any help would be great. And apologies if this is a dumb question, I'm no expert lol

Thanks

 

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thanks for the reply. Yeah tick the setting for force constant voltage and a ran a clock a bit lower than the one i posted earlier same thing. Is the +20% you say Power limit in AB? Even with this im gaining higher score and better min and max fps overall in unigine 4.0

 

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Well i am able to change my voltage it's currently 1.125V any suggestions here?

Just to clear it up sorry, do you want me to set power limit to 20 in AB is that what u meant?

Lastly for the card i have could u reccommend a overclock that may be stable? suppose it differs from card to card

 

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Quick update i put the power limit up to 20 as you said. Ran unigine twice with 1150/1500 and no drop at all so maybe the +20% helped? i'll re-run later

if i stumble again ill definately try out the advice you gave me thanks for that! I'll keep u posted if theres any more issues hopefully not.