Quote:
Originally Posted by thestache 
I have no idea what you mean?
As for the all display port, I had that and it still existed, not as bad as this but it will still very much there. I don't think there is a fix for this.
I have no idea what you mean?
As for the all display port, I had that and it still existed, not as bad as this but it will still very much there. I don't think there is a fix for this.
I mean, that if one has 2 cards crossfired then screen tearing, in my experience, tends to occur when one of the cards drops its clock into "idle" state while the other one does not. The 7990, as far as I understand is still a "crossfired" card although I'm not familiar in practice with dual GPU cards and dont know how it's arranged in the drivers. It was kind of long shot from my side anyway as I don't consider myself an expert on crossfire as I have only used 5770 + 6770 CF in combination of 3 and 5 screen eyefinity - not the most stable mix of stuff I must admit so my experience might contain some glitches which are not that common. Later on I flashed my 5770 into a 6770 which is not officially supported activity either. What helped, in my case, against screen tearing (I used 2x VGA displays at work with active display port to VGA adapters) was to make both cards always run at 850 MHz, even when idle. For that purpose I wrote a custom CCC profile where I changed the lower power states to these of the max allowed so the cards were always running at 1.2 V and 850 MHz regardless of load. Later on when my CCC profile got corrupt during the driver change and I had to do manual registry hacks to even be able to get into the windows without crashing I stopped using CCC profiles and just installed BOINC with projects that can use AMD GPU's and fired it up when at work, so the GPU's were always under some load and were not clocking down to "idle".
I dont think there is a fix for that either, there have been some workaround reported, like the one I suggested (A custom CCC profile or some other way of making sure card(s) always run at max frequency) but I have also seen reports that that does not help so it might not work for everyone.
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