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HD 7950 not gaining FPS when overclocking

post #1 of 6
Thread Starter 
Hey guys, I've been doing a little bencharking and OC'ing, and I've found something interesting. When I overclock the 7950 to 1100Mhz core, 1575 mem, and leaving the power control setings to 0%, I get a
avg. fps of 29.7,
score of 758,
min fps of 13.7,
max of 62.9.

Now when I up the power control settings to 20% same OC settings, the score changes to;
Avg: 36.4
Score:917
Min: 7
Max: 79.1

And as a reference, here are the scores for stock clocks (925 core, 1250 mem)
Avg: 29.9
score: 732
Min: 14.8
Max: 62.3

I find it really strange that the OC settings without adjusting power control yields absolutely no gain, I always thought that power control was merely voltages. Can anyone help explain to me whats happening here? Thanks a bunch! biggrin.gif
post #2 of 6
Try using MSI Afterburner
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post #3 of 6
Thread Starter 
I used it a while ago, it does the same thing. The benchmark runs fine, and no crashing or errors that I know of come up. Super strange blinksmiley.gif
post #4 of 6
To quote someone, raghu78, from another thread.
Quote:
You have misunderstood. Setting the power limit to +20% is the first step in overclocking. that allows the card to draw Max TDP, which means you can draw the maximum power for which the chip and board is designed. When you overclock the card power drawn by the card will increase and the +20% power limit will allow the card to run overclocked without any throttling of clock speed. If you keep it at 0% the card will throttle the clocks to remain within the ordinary TDP which is lower than max TDP. so really you will be hampering your overclock speeds and performance.

For a more in-depth read...
http://www.overclock.net/t/1210643/powertune-and-gaming

TDLR: Card is throttling due to not getting enough power for the overclock you set.
Edited by rageofthepeon - 4/3/13 at 11:56pm
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post #5 of 6
Thread Starter 
Ah, you're absolutely right. Running the benchmark while monitoring with GPU - Z shows it actually throttles back to 825 core, even lower than the standard 925mhz, and stock 1250 mem. That's so interesting, my old 5850's never had that. Is there a way to OC without drawing extra voltage, or is it impossible? +rep
post #6 of 6
Quote:
Originally Posted by MarkjBacani View Post

Ah, you're absolutely right. Running the benchmark while monitoring with GPU - Z shows it actually throttles back to 825 core, even lower than the standard 925mhz, and stock 1250 mem. That's so interesting, my old 5850's never had that. Is there a way to OC without drawing extra voltage, or is it impossible? +rep

Depends on how lucky you get with your GPU in the silicone lottery. Some chips can go higher than others with the same voltage. At a certain point though, depending on high you overclock, you will have to increase voltage to prevent system crashes and provide stability.
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