I have a Mac Pro 5.1, X5679 six core 3.2GHz, 16GB - ASUS GTX 680 4GB - 512GB SSD I found this one: Mac pro 4.1 2x2.26 GHz Quad Core Xeon E5520 x2. What if I buy it, flash it to 5.1, put a pair of X5679, put the GTX 680, put the 512GB SSD, and put it 64GB-Ram? Worth it the upgrade? it is noticeable? or keep the one that I have and up the RAM to 32GB?