hi everyone, I have Mac Pro 3.1 running High Sierra 10.13.6, 2x2.8 GHz and 32 GB of Ram. I just put a Sapphire Nitro RX 580 in it and it boots up fine and registers as "Radeon RX 580 8192 MB" in "About this Mac" but when I try to start FCPX (10.4.3) I get "This graphics configuration does not support hardware acceleration, which is required to run Final Cut Pro". I'm not overly computer savvy and I'm new to macs but I've read about other people using this card with FCPX. Do I have something set wrong or do these cards not work with FCPX or did I buy a dud second hand card? Also I should mention that because the RX 580 is quite high I couldn't fit it in slot 1 with my ssd card in slot 2 so I have swapped them around with my ssd drive in slot 1 and the GPU in slot 2. Many thanks in advance.