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Screen flicker when overclocking

post #1 of 20
Thread Starter 
I have an HD 6950 unlocked / watercooled

When I use either the default CCC or Sapphire Trixx to overclock, right after I apply the overclock my screen will flicker, buy only if I move my mouse, or for example, right click -> refresh on the desktop.

I am using Catalyst 12.10 and I have had this problem since the past 2-3-4 releases, before that there was no problem.

There is however a strange fix. If I apply an overclock and get the flickering (which I will do 100% of the time), if I unplug the HDMI cable from my card, then re-plug it in, everything is fine, there's no flicker, all works good.

Also there is nothing wrong with the overclocks being too high, as I have tried even increasing them by 1 point and each time the flicker happens until I re-plug my monitor.

Once I have done the whole process and played a game, everything runs fine, no artifacts etc.


I read somewhere else in my travels looking for a solution to this (I forget where now, i've been dealing with this problem nearly 8 months now) that it might have something to do with the card switching between 2D and 3D clocks or something. I tried modifying my cards bios to increase the speeds manually there aswell as increase the 2D clocks a little bit and I just bricked my card (which I was able to restore due to it being the HD6950 Sapphire TOXIC card that has a switch on it to flip between 2 separate BIOS)



So in conclusion, can anyone help? Is this an ATI CCC problem that we just have to (sigh) wait for them to hopefully fix in the next 10 years? Is it something the Sapphire Trixx team can fix? Is there a simple fix I am not aware of?


Thanks
Edited by paradoxum - 11/13/12 at 4:23pm
post #2 of 20
Thread Starter 
bump

Is anyone else even getting this?
post #3 of 20
I get flickers in a few games but it's just a confirmed bug with cat 12.10/12.11 drivers as far as I know.
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post #4 of 20
Thread Starter 
I only get it once when I change my overclock settings then strangely re-plugging my hdmi cable fixes it. every time I boot into windows and trixx changes the clocks it happens. even changing them in the ccc is the same. it's really beginning to annoy me. still in 12.11 beta drivers after a format.
post #5 of 20
Same problem! If I disconnected the HDMI cable, it is fine wow thanks haha. This issue is soooo strange. I really don't get it. I noticed if you boot with the frequency you want to use, it is fine too.
I use MSI afterburner and set apply overclock at system startup.

Very very weird and frustrating issue. Got it with 12.10 update.
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post #6 of 20
You should read my sig thread. You have a flashable Cayman card, you should be using RBE and Overdrive.


Btw, you're bricking your card while flashing the frequencies because that part of the bios is signed. Big no no with Cayman bios'.
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post #7 of 20
Maybe this example is different from your flicker issue, but when I ran a HD4890 for a while, if I had power saving options in windows set to turn off the screen after some time, sometimes I couldn't get the card to output again after waking the machine until I unplugged and reconnected the DVI cable.
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post #8 of 20
Quote:
Originally Posted by tsm106 View Post

You should read my sig thread. You have a flashable Cayman card, you should be using RBE and Overdrive.
Btw, you're bricking your card while flashing the frequencies because that part of the bios is signed. Big no no with Cayman bios'.

Wouldn't it kill your warranty to flash with custom BIOS?
Also, I have another problem, the clock while gaming stay at 500mhz on core which gives awful FPS. If I overclock by 1+MHz (downclock works too), the card will bump its frequency correctly from idle (300 to 900+) instead of capping @ 500Mhz which is the frequency when using youtube or flash stuff.
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post #9 of 20
Quote:
Originally Posted by Just a nickname View Post

Quote:
Originally Posted by tsm106 View Post

You should read my sig thread. You have a flashable Cayman card, you should be using RBE and Overdrive.
Btw, you're bricking your card while flashing the frequencies because that part of the bios is signed. Big no no with Cayman bios'.

Wouldn't it kill your warranty to flash with custom BIOS?
Also, I have another problem, the clock while gaming stay at 500mhz on core which gives awful FPS. If I overclock by 1+MHz (downclock works too), the card will bump its frequency correctly from idle (300 to 900+) instead of capping @ 500Mhz which is the frequency when using youtube or flash stuff.


That's strange... isn't everything we're all doing voiding the express warranty? Overclocking, unlocking shaders, volt modding, and watercooling? It's rather par for the course ya know.


Are you a cayman user? Have an unlockable 6950? If so, you shouldn't use AB (except for OSD), Trixx, or whatever. You are blessed with an editable bios, the holy grail. Tahiti owners are screwed w/o this bios access. RBE + Racerx = the win.
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post #10 of 20
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

You should read my sig thread. You have a flashable Cayman card, you should be using RBE and Overdrive.
Btw, you're bricking your card while flashing the frequencies because that part of the bios is signed. Big no no with Cayman bios'.

I'm confused. First you say I should be using RBE, and then you say I am bricking my card by flashing the frequencies? so how am I supposed to use RBE to overclock?
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