Hi Guys/Gals, I have a Quicksilver 2001 ( 733Mhz, 1.25 Gbyte, several drives). I am thinking that I want to run Leopard but need to pick up the CPU speed. I have looked at several sites for these upgrades. However they offer different sized cache and memories. I am really confused. Please help me out; a) Does Leopard use a dual processor?? I don't mean will the various apps take advantage of the dual, does Leopard itself use it? i.e. will my system run better with a dual? b) What size L2 and L3 cache do I want? c) Vendor -- Sonnet, OMC, etc Which vendor? What is the best upgrade ? d) Do I need to upgrade my video from what came with my Quicksilver? And if I do, what is the best? Thanks much for your help, Rich No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.15.25/1118 - Release Date: 11/8/2007 9:29 AM