My problem is straight-forward: Ever since switching to a clean-install of Windows 10 64-bit, CrossfireX has been messed up for my HD6990; and none of the different Win10 drivers solve the problem. Under Windows 7 (64-bit) it pretty much worked fine. BTW, I'm using MSI Afterburner for manual fan control - which wasn't a problem under Win7 and shouldn't be a problem now). GPU-Z says that crossfire mode is enabled on both devices, and ULPS is disabled, BTW. Symptoms: Some* games and full-screen apps will "flicker" badly in Fullscreen mode when CrossfireX is enabled - kinda like page-tearing but a bit different (it's clearly an AFR problem). Even the PCIE bus-test render in GPU-Z shows this problem when in fullscreen. GPU-Z and Crimson both say that the two GPUs are indeed linked and crossfired up properly, btw. They stop flickering when games are set to borderless window mode (Crossfire is being forced to deactivated); Trying to disable crossfire in the control centre or crimson has absolutely no effect whatsover (the drivers appear to be ignoring that command). Switching to different methods of crossfirex doesn't fix the problem, nor does toggling frame-pacing. Turning of ULPS has done nothing. I've done a full wipe and purge of all video drivers on the system and clean installs with all the windows10 (64-bit) drivers released to date, although some have disabled crossfireX support altogether, none have actually address the problem. Having "enable crossfireX for games without a profile" unticked has no effect.Toggling v-sync has no effect. Now that HD 6000 series is considered legacy there's apparently going to be no more drivers, and with none of the existing Win10 drivers actually working right I'm kinda boned. Are there any community drivers? Or a community repackage of working Win7/8.1 64-bit drivers that might address this issue? I've tried manually installing the Win8.1 drivers, but Win10 doesn't want to revert to an older version; and I can't seem to find the exact driver files to force it to manually. Any third-party apps that could sort it? I'm really desperate - I've been fighting this issue ever since installing Win10, and I'm getting to the point where I've exhausted everything I can think of. I've even tried pulling the card out and double-checking it's seated correctly (it is fine, of course) in case it was something as simple as a hardware issue that just happened to perfectly coincide with Win10. *Some games are fine: For example just tried Elder Scrolls online - puts both GPUs under load correctly, no problems with the rendering whatsoever. U3 games are negatively effected, as is League of Legends and many others.