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Problem with (overclocking) Radeon HD 7950 - dual-monitor -> screen flickering

Tags:
  • Overclocking
  • GPUs
  • CPUs
  • Intel i5
  • Radeon
Last response: in Overclocking
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April 23, 2013 3:39:14 AM

Hey everyone,

I'm really new to overclocking but benefited from the experience of a friend. So I tried overclocking myself on both my gpu and my cpu.

I could achieve 4.3 Ghz on the i5, and went up to 1150Mhz on the gpu. I used OCCT for processor's stability (several tests, some up to 30 min, and didn't get freeze). For gpu's stability I used 3DMark11 and 3DMark, FurMark and Unigine. Along these tests I didn't spot any graphical artifact and so I guessed I was fine.

However, I then plugged in another monitor (one hdmi, one dvi), and started using my computer (playing games mostly and reading articles and stuff on my second screen). I then realized my screens tended to have some "jumps" (I can't find the word in english). Screen gets some horizontal lines that move a bit and disappear 200ms later or so. This happens every 5 min, maybe less. Once, the entire screen froze displaying horizontal lines of all colours in a messy way, but my second screen still worked properly (I could go to the windows8 start menu for instance)...

So I'm really wondering where this phenomenon is coming from : i5's overclock, gpu's overclock ? gpu problem when one hdmi and one dvi connected? ...

If you guys have no idea, I guess I will remove the OC and see...

More about : problem overclocking radeon 7950 dual monitor screen flickering

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April 23, 2013 3:59:13 AM

Try to clock your GPU slightly lower like 50-75 MHz, I'm almost certain it will solve the problem.
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April 23, 2013 4:09:15 AM

Typical issue with overclocking and using multiple monitors and HDMI. I've had these "screen jumps" in the past as you describe them. Just lower your overclock and make sure you got latest drivers and CCC profile. The problem is that with multiple monitors the GPU clocks are sometimes freaking out. It is DEFINATELY not a CPU issue.
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April 24, 2013 2:17:35 AM

tlg said:
Typical issue with overclocking and using multiple monitors and HDMI. I've had these "screen jumps" in the past as you describe them. Just lower your overclock and make sure you got latest drivers and CCC profile. The problem is that with multiple monitors the GPU clocks are sometimes freaking out. It is DEFINATELY not a CPU issue.


Thanks for your fast answers.

What is CCC profile ?

Is it a problem of multiple monitors or the fact that there is two monitors AND one of them that is HDMI ? Because I can swap to dual DVI if that's the problem I guess, using the mini display ports of the gpu.

Anyway I'll start by lowering the gpu frequency in the meantime. But I'd prefer it to be just a HDMI trouble.

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I went back to the original clock of the gpu to see what's happening and I still got some "screen jumps" but much less often and much less important as well. It occurs from time to time, barely perceptible though. I could see one while playing. It was so fast that I wondered if it wasn't some FX in the game that caused it, but I'm sure it wasn't because there is no such FX in this game...

So... maybe I need to have both monitors on same port type? both hdmi or both dvi? Would it change anything ? Otherwise I guess it's good enough right now, but still... shouldn't happen at all.

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I will try to disable AMD Overdrive as suggested in this link http://www.hardwareanalysis.com/content/topic/74589/
and see. I wonder however if disabling this option in Catalyst prevents from overclocking. Don't see any reason why it would... But then, disabling the option in catalyst may just prevent any overclock, and SO remove any OC, and SO OC is still the main problem.

Other interesting info here http://www.overclock.net/t/1037034/how-to-fix-dual-moni...
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