I'm thinking of buying this... http://www.centrecom.com.au/asus-radeon-strix-r9-390x-8gb-gddr5-graphics-card ...because I read on MacVidCards.com that Radeon GPUs don't need drivers because they're prebuilt into to OSX which suits me just fine. It's a big card so I just want to know if it'll fit. And it requires an 8-pin and 6-pin power cable so will I be able to use a 6-8pin adapter to run it off the logic board? Also I read this on MacVidCards.com; "When installed in a Mac Pro a stock PC GPU will only be able to utilize the outdated PCIe 1.0 format. A card flashed with a Mac BIOS will be able to work at PCIe 2.0 speeds, supporting twice the data rate." I wasn't planning on getting this flashed so does this apply to me that it'll only have PCIe 1.0 speed? It also says this; "Cards with our Mac BIOS are able to run their full monitor arrangement (unless specifically noted) and make use of the most up to date technologies, including 4K monitor support and CUDA, OpenCL and OpenGL support." Again, does this apply to me?