I have a Mac Pro 4,1 that is flashed to 5,1 firmware. Currently running OS 10.13.4, 48 GB RAM 1066Mhz RDIMM [purchased a 48GB Kit from OWC https://eshop.macsales.com/item/OWC/85MP3S9M048K/ ] - 2.6ghz 4 core W3520 processor I am wishing to upgrade the CPU to a 3.4ghz 6 core X5690 processor. Will my system still boot and run OK with the above 48 GB ram kit or do I need to get different ram for use with the 6 core processor? My current understanding is it should work fine, but I am still at 1066Mhz RAM instead of using the full potential of the 6 core processor at 1333Mhz....? Please correct me if I am wrong! Thanks for your help!