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More Core Clock = Less Points in 3D Heaven

post #1 of 25
Thread Starter 
First of all, sorry about my rusty english.
I had a MSI HD7950 ( 830MHZ core clock) wich i trade recently for a Gigabyte HD7950 WF3 ( 900MHZ / BOOST 1000MHZ) . The main reason for the trade, was temperature, MSI was getting hot under load, even in stock !
I used MSI afterburner to squeeze a bit more from MSI, and it went fine! A little more core clock, 3D heaven for cheking stability, a bit more, etc .....
With MSI, i could reach 1100MHZ and 1365MHZ Memory clock, and in the process, the more i push core clock more points in 3D heaven, till a black screen apeared .... So back up a bit, and everything great.
But now, with Gigabyte HD7950 WF3, i can put the slider right to 1200MHZ core clock, no errors or artifacts in 3d heaven, but the score is lower than stock value ....
Anyone has an idea why this happen ?

PS: Sorry about the noob question.
post #2 of 25
you hit a overclock wall, sometimes if you overclock too high and you run things like Heaven you actually would get a lower score than if you were at a lower clock, i hit that wall on my 460GTX when i overclocked it to a stable 950mhz core and 4000mhz memory but got a lower score in Heaven than when i was at 925mhz Core at 4000mhz Memory
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post #3 of 25
I saw that with my titan, though it was at a pretty low boost clock... I didn't get worse scores, but it never got any better.
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post #4 of 25
Keep an eye on the GPU-Z core speed because it's most likely throttling under load.
post #5 of 25
Quote:
Originally Posted by Fulvin View Post

Keep an eye on the GPU-Z core speed because it's most likely throttling under load.
Yep, mine wasn't. It's odd, but then I have a crap Titan. Runs flawlessly at stock settings, but anything more than +25 mhz and I get insane amounts of artifacts in GW2 (which might be driver related, I had problems with the latest beta). I generally cannot run more than +75 anywhere else, yet most everyone else is reporting +100 or more.
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post #6 of 25
Yup had same thing with my gtx470's...

Stock 608MHz, at 800MHz all good, 930MHz got worse...
   
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post #7 of 25
Thread Starter 
So, a normal situation i see ...

I was in a kind of a doubt, because in my previous GPU ( MSI HD7950 ), when i reach the limit of overclocking ( aprox 1152 MHZ ), the 3d heaven crashed, so i new i was near the maximum alowed by the GPU, but in gigabyte WF3, i put everything max and runs the test without problem, except for lower scores ....

Do you think it could be usefull to update the bios GPU with the latest avaiable ?
post #8 of 25
Thread Starter 
Quote:
Originally Posted by Fulvin View Post

Keep an eye on the GPU-Z core speed because it's most likely throttling under load.
~

Thank you for your patience, but can you go a bit deeper into that ? Can you please explain me how can i see the "trotlling under load" ? In other words, if it's trottling under load, what should i see ? A decreasing speed in memory clock when it should be stable, or maximum memory clock that doesn´t go any further ??

Thank you very much for your answer, very apreciated !
post #9 of 25
You're probably not feeding enough volts into your GPU. It's not enough to cause problems but enough to degrade performance.
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post #10 of 25
Throttling causes the core clock to drop under load, which you can see in the GPU-Z graph or using Afterburner. If it does not throttle, you should see a nice straight graph showing constant 1200Mhz, or whatever you have it set to.

Have you over volted it? If you have not, then it's very likely that it's downclocking / throttling under load.
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