I recently purchased a Saphire 7950 Mac edition to replace the stock video card in a Mac Pro 3,1 running 10.9.2. I am running 3 DVI monitors (2 at 1200x1600 resolution and the 3rd at 2560x1600). I bought 2 active mini displayport adapters and use the DVI connection for the higher resolution monitor. I can successfully setup 2 monitors as long as I use a passive mini displayport to DVI adapter . As soon as I plug in an active mini displayport to DVI adapter the computer reboots. Because of this I can only use 2 monitors as the passive adapters will only allow one monitor connection. I have even tried a Saphire branded active adapter that still causes the computer reboot immediately when plugged in. Any suggestions?