2010 iMac 5,1 Display Out to two Monitors with MSI AMD R9

[Guest MacYeti]

Hey everyone, need some advice on some things and I figured this was the place.

 

I have a Mac Pro 2010 5,1 that I have had for a few years now. Purchased a MSI AMD Radeon R9 390X series to bump up the graphics. I also have a Late-2009 27" iMac sitting around that I was hoping to use in Target Display Mode as a second monitor. Still works but at a snail's pace. I bought an HDMI to Mini DisplayPort cable hoping that might work but, of course, it did not.

 

Just to check, I have used...

 

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Source: MacRumors