Hi all, after a few years using a 2009 Mac Pro with a PC GeForce GTX 760 card I had too many problems (black screens after software updates breaking Nvidea web drivers, El Capitan breaking Bootchamp etc...) I finally gave up on PC Cards and bought a used Apple branded Radeon 5870. Two problems now: If the Mac Pro falls asleep while running OS X it no longer sends a signal to my monitor (using a Mini DisplayPort to DisplayPort connection). The only way to get video back is to unplug the cable and switch to another port or restart the computer). Video card operates fine otherwise pushing a 2560 x 1080 resolution. I remember having the same problem with a Dell display and the solution was to change a power setting on the monitor and switched to DVI (neither are an option now). While running Windows 7 or 10 the graphics card has problems keeping a stable resolution with the display. It wil occasionally push the full resolution, but eventually reverts to a super low one. I've tried doing a clean install of both operating systems and the problem persists. Using the AMD site or Windows software update fails to find any drivers for my card. I installed Apple's Bootcamp drivers and the problem still exists. Any ideas for either of these problems? Anyone have current drivers for a 5870 that work with Windows 10? Thanks in advance!