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

[P0X_]

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

 

[tommybhoy]

It's not stable on the core at the clock you set it at and the boost bios is doing what it's meant too-reduce the core, you need to manually set the core and select force constant voltage in AB.

If AB doesn't work, use trix and manually set the core clock through it and add a tiny touch to the voltage, with +20% on the power.

 

[P0X_]

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

 

[tommybhoy]

Yes, I doubt AB will do much for you though in the way of voltage although it states in AB that it applies, it doesn't.

Trixx worked for me before I sent it back.

 

[P0X_]

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

 

[tommybhoy]

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

Download this:

www.techpowerup.com/downloads/2221/TechPowerUp_GPU-Z_v0.6.9.html


First off, run gpu-z, click the second tab 'sensor' and leave it open on the dektop and check the voltage reading while running a game/bench mark like Heaven.

Then apply a small amount of voltage and do a game/benchmark again and check through gpu-z that it actually has changed.

If not, time for Sapphire Trixx oc tool and do it all agian, but you need to keep AB closed until you have finished in Trixx.

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

Yes.

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

1100/1500MHz should be stable, but it's nothing anyone can guarantee.

 

[P0X_]

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.

 

[tommybhoy]

Glad you got it sorted.

 

[spoffle]

I like your sig Tommy