MSI Twin Frozr III 7950 OC results strange?

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VXBlade

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I recently bought a 7950 OC edition from MSI and I was testing the OC capabilities. I've never really done this before, so I wasn't really sure what to set it to. But I started with +20% Power, 1200 Mhz core clock, and 1500 Mhz Memory clock, I then ran Furmark for 15 minutes and it ran just fine. Temps at stock clocks topped at 71c, when I OC to the settings above, it topped at 74c.

The thing is, CPU usage peaked at 100%, but the frame rates didn't really go up with FURMARK... and they stunk in both stock and OC mode. 13-14 fps with 8XAA enabled at 1920x1080.

Is furmark a good stability test for OC? or should I be running other stress tests of some sort? Also, in windowed mode the Frame rates are 30 solid... in fullscreen they are 13-14...
 
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No, but the overclock is very high and could lead into bricking some components on the GPU. The power required for such an overclock could potentially damage the power regulation on the PCB, as high voltages will be needed for such an overclock.
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Ty_Killington

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im no expert but i believe that the problem si not the card but the test . 8x AA will absolutely punish framerates. 8xAA proceeses the image at 8 times resolution then downsamples it to ur normal resolution to smooth edges. 4x AA should be half the hit and so on. in real world scenarios even 2X AA can destroy frame rates at high resolutions. try those tests with lower AA.
 
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JJ1217

JJ1217

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Woah back down there pal! 1200 is way too high off the bat for a 7950, especially when it seems you are not experienced with it. Mixed with Furmark, you could've easily destroyed your new card. Take it up slowly, 25-50 mhz core at a time, and add voltage to compensate if you find instability. Most 7950's hit around 1100 at around 1.15-1.2 v. I would recommend starting at around 1000, at around 1.094 V, and start pushing up until you find the maximum core you can get to. Leave memory at stock. Add 25-50 mV of voltage, and push up a little.
 
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lostgamer_03

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Furmark is limited, it doesn't support high clock speeds because it is too old. It is not good to use anymore. For example, my GPU is overclocked to 1165 on the core, yet is won't move above 915. In games and other benchmarks it peaks even higher than 1165 (as I got boost) normally around 1250-1300 MHz.

Try Unigine Heaven Benchmark 4, it's a fairly new and demanding benchmark that sure will give your GPU a challenge and will give you a better perspective of the performance gain of your OC. It's free. :)

Also as mentioned above, cut a little bit on the overclocking. You don't wanna fry your GPU.
 
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JJ1217

JJ1217

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Or better yet, run an actual intensive game. Benchmarks are okay for checking if it won't crash immediately, but there are certain things you can do in games or certain motions that will really stress an overclock.
 
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VXBlade

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Thanks for the advice. I have a question though on OC'ing in general. Can temps in the 73c range fry the card with a 1200/1500 set clock rate with no voltage OC?
I realize I did this wrong, but do I have to worry about the 15 min test I ran in the long run for over stressing the card during this test?
 
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JJ1217

JJ1217

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It may not necessarily fry the card, but you can damage components if you jump right into high overclocking. Considering most 7950's hit 1.1 GHZ, you might understand why starting with 1.2 GHZ is not a good idea.

The temps are fine. I doubt 1.2GHZ without an voltage change will actually work in a game though. Furmark is a bad program to load your GPU, Nvidia and AMD have made their graphics cards throttle in these applications. Try using something like Unigine Heaven, as suggested, or better yet, Valley. Also try some games.
 
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lostgamer_03

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No, but the overclock is very high and could lead into bricking some components on the GPU. The power required for such an overclock could potentially damage the power regulation on the PCB, as high voltages will be needed for such an overclock.
 
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VXBlade

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But I never increased the voltages. So wouldn't that just more than probably been an unstable overclock (Even though I never saw any due to my poor choice of testing software)
 
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