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GPU usage drop in game when Overclocking HD7970

post #1 of 4
Thread Starter 
Using MSI afterburner, i got my gigabyte OC7970 to a stable 1200 core/1500 memory running on 1200mv. On 3dmark11 my graphics score went up from 8400 to 9500 after the overclock, with 100% gpu usage on these both times.

However, whenever i use BF3, the lower the clock speed the higher my GPU useage will be (and also more stable, not spikey gpu usage that occurs ). When running normally it varies between 90-100%, but when overclocking it goes from 70-90%. It seems that overclocking will give me no difference in games (ran a benchmark, only 3 average fps difference) as the GPU usage goes down in order to accommodate the overclock.

I also doubt its a CPU bottleneck as my i7-870 dosnt max out on BF3. Anyone got any insight into this?
post #2 of 4
It's either a CPU limitation or because you have Vsync on. Your CPU doesn't have to be loaded 100% to be bottlenecking.
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M1XN
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Noctua NH-C14 Windows 10 64-bit ViewSonic VP2770 Vortex Pok3r 
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post #3 of 4
I agree that it's probably a Vsync related problem.

Either that or your GPU really does bottleneck your i7. If the i7 is at stock, it might very well bottleneck it. The 7970 is a potent GPU. I remember I had to overclock my X3440 up to 2.8GHz from the stock 2.53 to make full use of the old GTX 470 I had in some games.
     
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post #4 of 4
Thread Starter 
I upgraded to a 2500k and it still had the same problem.

However, i upgraded my monitor (from 1600 x 900 to 1080p) and the GPU usage problem has dissipated into thin air, it seems that the monitor was limiting my performance, Ive never heard of anything like it happening before.
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