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Sapphire HD 7850 Overclock Screen Shudder

post #1 of 5
Thread Starter 
I began overclocking my 7850 with MSI Afterburner, increasing memory clock first to find a good frequency (testing with FurMark) . At 1400 MHz FurMark died on me and my screen went blank (bunch of random red/black squares), so I turned it down to 1350 MHz where it was previously stable. I moved on to the core clock and got that up to 1050 MHz. I had to leave my computer for a while so I stopped there and figured I would try to push it some more later.

Fast forward a few hours later and I am back at my computer trying again. This time, however, any increase at all in either the memory or core clock causes my screen to shudder with random black lines appearing/disappearing across the screen - and this is occurring during normal computer use (e.g. web browsing) the instant the overclock is applied. I tried to run Tomb Raider to see what would happen, and it ended up crashing with a blue screen of death after 15 seconds of playing.

Any ideas as to what could be going on?
post #2 of 5
Sounds like an unstable overclock. Try adjusting one setting at a time, rather than both memory and core at the same time. After you have verified that your stable on the core, or memory, then move to the other.

It will be difficult to determine which is causing the issue without a more methodical approach. I recommend resetting to stock and verify your stable and that the visual corruption is no longer existent. After you have verified that, then work on your core, and then your memory.


I hope this helps biggrin.gif.
post #3 of 5
Thread Starter 
Thanks, unfortunately that is exactly what I did. Right now everything is at stock and working fine. If I move either the memory clock or the core clock up by even a single MHz, I get the screen shudder problem previously described.
post #4 of 5
Thread Starter 
So, I figured I would give the overclocking a try again using TRIXX instead of Afterburner. This actually seems to have worked. I am at 1060 MHz core clock and 1350 MHz memory clock and just played an hour of Tomb Raider with no problems, and there is no screen stutter on my desktop. I will try and push the core clock further tomorrow and see what happens. It seems like something was just wrong with Afterburner...
post #5 of 5
I wouldn'T thouch the Vram. Just do some tests with overclocked Vram and with vram @ stock. You will see that it gives you only a really small performance boost not worth overclocking it. The Vram is causing the most issues in my opinion. Also the Sapphire doesn't have coolers on the Vram so overclocking it makes it even more risky.
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