HD 7870 second screen flickering

[solidgallium]

Hi everyone

i own an hd 7870 by sapphire (dual-x) and i have a dual monitor setup (1280x1024 via dvi-i and 1920x1080 via dvi-d adapted to vga)

when i try to overclock my gpu i get a weird flickering issue on the second screen (1920x1080). i looked on the specs and it says the max resolution it can run is 2560x1600 (which i still don't reach in terms of pixels rendered). i've been fighting against this problem for a long time and i recently noticed something: when the screen flickers the gpu clock and memory clock start jumping between 400 and 150Mhz, but when the clocks are stable at the overclocked value (1150mhz core and 1400mhz memory) there is no flickering (which explains why i never get this issue while playing games). so what i think would solve this issue is to be able to lock the frequencies at the desired ammount. is there a way to do that without modding the gpu bios? msi afterburner's unofficial overclock settings (with and without powerplay) either lock my clock speeds at 150Mhz (without going up in games so they run at 3 fps) or they crash my computer as soon as i hit apply. i tried with the overdrive settings in the gpu driver but it behaves just like afterburner with the official overclock settings

 

[solidgallium]

also i tried to screen shot a flicker but it's a screen thing only, it doesn't appear in the screenshot.

i tried with other monitors and other cables and no adaptors and the problem is still there

 

[faziten]

AMD GPUs from the 7000 series should bump the core clock to 300 and memory to 500 or something with dual monitor setups and a bit more voltage dont remember how much more.. Its normal and that's how those gpus used to work. Had a 7950 so know the issue first hand.

 

I remember having issues with different refresh rates too, so you may have to check both are at the same refresh rate, and try everything at stock first.

cheers!

 

[solidgallium]

thanks for the answer! both monitors are at 60hz. the gpu core clock idles at 300 when it doesn't give me this problem but drops to 150 when this issues comes up (so the screen starts flickering) and it also locks at 150 when i overclock with the unofficial settings in msi afterburner. at stock the gpu works just fine, as soon as i change the clock either for memory or core it starts flickering, even if i underclock it