Hi, today I bought a Mac pro 4,1 8core 2.26, 20G RAM 1066, and I want to constantly upgrade it to a 5,1 12 core. I have some questions and hope some one can give me some advice: 1. I just bought it at 370$, is it a little bit over price or just right? 2. if I just upgrade the firmware to 5,1 with out upgrading any hardware (still original 1066 ram and 8core ), will it still work properly ? 3. I have two "Kingston HyperX FURY 4GB 1600MHz DDR3 CL10 DIMM", could I use them on my mac pro? 4. I just reviewd some video on the youtube and found that some one screws the heatsink very very carefully ...and said if too tight you will break the motherboard and cpu. Is it really so tricky to do that? How do you know it is tight enough? 5. If i upgrad the firmware to 5,1, could I install the high sierra directly from the apple store? or still need patch? Thank you for your kindly help!