Mac Pro 1.1 Upgrade CPU's part 2 (2 Intel Xeon X5355 Quad Core 2.66Ghz) - YouTube
Also below is a link on a full upgrade in written format with picks to better explain the process. http://www.hardmac.com/articles/70/page4 Below are links to where I purchased and full CPU specs & model numbers. https://www.serversupply.com/ HH80563KJ067...