Hello all, I'm writing with the hope that someone here will have tried what I want to try, or will at least be able to give some insight into it. I have a 2006 model Xserve, with (2) Xeon 5130 (Woodcrest) dual core CPUs @ 2.0GHz, giving me a total of 4 cores. I have the chance to get a pair of Xeon E5335 (Clovertown) quad core CPUs @ 2.0GHz for next to nothing, potentially giving me a total of 8 cores. These are the SL9YK model, B3 stepping. Clovertown is a drop-in upgrade to Woodcrest, but since this is a piece of Apple hardware I'm afraid things might not be that simple. I've read plenty of reports (some here at MR) of people dropping in Clovertown CPU into Mac Pro towers with great success. Apple themselves began 'dropping in' Clovertown 3.0GHz CPU into Mac Pros as a BTO option later in the Mac Pros life, but they only offered the 3.0 GHz speed. This almost has me convinced, but I've also seen brief mention that only certain steppings of Clovertown can drop in successfully to Mac Pro. I've not seen mention anywhere about CPU upgrades on XServe, but I'm hopeful that someone here can lend some insight. Thanks in advance to anyone who can offer some technical insight, or, better yet, experience into my potential upgrade. Thanks!