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Can my ATI Radeon X1900 XT run in my intel mac pro (1,1) 2006?

Question asked by topherpsu on Apr 8, 2017

I have a mac pro 1,1, the first intel model, and I have it running el capitan, with 16GB of RAM & the OS running off of a SSD.  I bought this card, being told it would work in my mac pro, and it "works".  I only get one of the video ports to display, and every movement of the mouse, let alone the windows makes the screen all choppy, and redraw itself a bunch of times.

I've seen screenshots in old posts in forums that are closed saying it works, but I can't find any drivers or anything.

I will HAPPILY provide any information you need to help me with this.

PLEASE help me!

Thank you a million times in advance!!!