@chune which version of Windows and AMD drivers are you using with the R7 240? I'm trying the R7 240 as well and I'm running into blue screens and general non working. I'm getting the exact same non working behavior with a 7870 as well, which works perfectly passed through to an El Capitan VM in the same host. With a Windows 10 VM however, it blue screens if a monitor is connected, and won't even boot up after the Catalyst drivers are installed (just a black screen on the card and the VM console)