For a while I was convinced the X5690 3.46 was the best option for my 5.1. However I saw in a recent thread someone mentioning the X5680 (3.33) instead which apparently would give me just about the same kind of boost for a fraction of the price. Both are 6 core if I'm not mistaken so what would you recommend? I need a pair. And of course there's the GPU..... I'm tempted by a 7950 mac edition but it's not cheap even in 2018, and I want to make sure I'll be ok for Mojave. I know we already have a thread about the 2010/12 cMP and mojave compatibility - maybe I missed a few posts but I'm not clear on the 7950 with Mojave... In any case I think I'll start with the cpu upgrade. tx!  - I settled for an RX 560 to replace the aging and non-Metal HD5770 and it's working perfectly. #10 - after a bad experience with a non-working pair of CPUs, I decided to get a new pair and installed my new CPUs successfully. See from post #79 for the details.