Right here it is you may have heard of a similar problem before but mine is well seemingly not fixable...
I recently updated my 4870x2 saphire with 10.10 drivers, however when i did in every game i play after thirty seconds the screen will flicker fps will drop to about one it will flicker again then the screen will go back to decent fps, however the same thing happens every few seconds now and now again. Now from what i can see this is obviously an issue with rendering 3d objects ingame, as it only happens ingame.
So what i did was to revert back to my old drivers and wait for 10.12 to come out. However supprisingly the problem kept happeing even though I had reverted. So I uninstalled the ati drivers, then used driver sweeper/cleaner in safe mode to clear up any old remnents then installed the old drivers once again (while deleting anything by ati last modfied recently as well), but this did no use either and the problem continues. Today I downloaded 10.12, and....same problem once again, the new CCC is good as well by the looks of it but no change to my problem. I read of similar problems other places where they were saying it maybe crossfire so disable ATI catylist, but this did nothing nor did any other setting i changed. I've downloaded ati tray tools as well, and it has done nothing.
So I come to these forums running or ran out of idea's to fix my screen flicker/fps drop. I was hoping maybe invien that someone could shed some light on the situation for me as ati support havent really supported me as of yet. All i can think of now is reverting back to 2009 drivers, or system restore or windows reinstall.
Pritty sure now hearing other peoples problems and a few videos similar to my problem. And feeling the card after the comp has only been on for 5mins, the tempreture is massive even at idle so, to me it looks like its an overheating problem. Any tips on how to keep it cool would be nice, as iv already put up fan speed to 100% the whole time now. However looks like i'll be getting my hands on gtx 570 so for the first time ill be swapping over to nvidia, to many issue with ati the past 6years!
I have the same sort of problems with my 4870x2. Tried lots of things including disk fromat and re-installing OS. The only way I can run Empire Total War and Shogun 2 properly, is to run them in windowed mode (ingame, options, graphics, windowed). Works well even at 1920 x 1200 although I lose some screen space at the edges.
Fixed it mate, its (for me) was the dirty and clog dust ect within the card, which causes it to do that, undcrew every screw to get into the heat sync blocks, on the side of one closest to the fan should be filled with dust and cloggy stuff, clean that, and clean the second heat sync block and you'll be as good as new!