I currently own a Mac Pro 1,1, and it works like a champ. Runs logic beautifully and runs the few games I play pretty decently. However, at some point in the next year or two, I foresee myself upgrading to a 3,1 purely due to obsolescence (El Cap will start showing its age at some point). Prices are coming down on them and they can be hacked to run Mojave. It should mostly be a matter of buying the machine and then just transferring over my hard disks. However graphics cards are a bit more finicky on these machines than other parts. I currently have a Radeon 5500 in the machine, but i would like to upgrade that card so I can run slightly more recent games on low settings. What's a good graphics card that will run in both the 1,1 and the 3,1 when I get it, that's better than the stock card in the 3,1s? Budget is around 100-150 GBP.