• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

R280X Dual-Screen Flickering

Ease

Ease

Ease

Associate
Joined
14 Dec 2008
Posts
628
I've got a really irritating problem with my set-up, and I assume it's due to the new R280X.

When I'm in dual-screen with my primary monitor at 1080p, and the secondary at 1650x1050, then everything is fine.

But when I switch the secondary to my widescreen TV (1080p), suddenly the bottom fourty-odd rows of pixels of my primary monitor go mental, flickering crazily.

I can reduce, and almost eliminate the flicker, if I set the scaling on my secondary screen to overscan, but then the top and bottom 5% of the display are missing (outside of the boundary of the screen).

Obviously, I've updated all my drivers, and even tried Beta drivers.

Any help would be greatly appreciated!
 
This sounds awfully like a problem I had with my old 5870, although it was my understanding that AMD had solved this in newer drivers. What it essentially came down to, was that in order to drive more than 1 display, the memory had to run at a higher frequency than its single display idle clocks. The flickering was due to the clocks and voltages remaining in the single display idle mode.

Unsure if this is the same problem, but would be interested to know what your memory clock is when you are displaying to both devices.
 
Ease said:
Memory clock seems to (according to GPU-Z at least) run at 1500MHz regardless of which screens are on.
Click to expand...

That seems to be correct, assuming you are still outputting to both displays. Single display the memory should drop to 150Mhz. That doesn't really help your problem though. I wonder if perhaps the memory could be slightly unstable and requires a slightly higher voltage to maintain the current clocks.

Could you try either downclocking the memory slightly (unsure if this would be over-ridden at driver level during multi-display mode), or failing that ever so slightly increase the voltage level?

I might be way off, but it does sound similar to the issue I had back on the 58 series and that was memory/ voltage related.
 
Finally got around to trying that; no success :( So frustrating. Can't tell if it's a GPU problem or monitor problem either :(
 
You must log in or register to reply here.
Back
Top Bottom