Hi juiseman, I've checked the boot block and the dimm configuration, I have 6 dimms and it seems a later boot block so the X series Xeons should work, I shall test it by installing a X5650 from my T3500. My prices are all in Canadian fiat dollars, it's only worth 3/4 of that of the US dollar these days and dropping, plus shopping locally means no shipping charges ... I've temporarily installed a W3565 and I get the irritating message that I need a high performance cooler, I can try the pin mod, I believe to connect pin 1 to pin 5 to fool the bios, but, the message disappears after I boot into windows
! I did run into a problem with a password protected bios, but, after a bit of searching I found out how to reset the bios and clear it so I could access the options. I've read that thread you kindly posted on Sunday after I purchased the Z400, it's very good information!
I've managed to acquire enough memory that I now have 12gb or 24gb in each machine. Everything seems to work pretty well thus far. I'm fairly new to working with computers and it's been very interesting so far! I think my favourite one is the T3400 which I started off with first, that's a reasonable machine with the Q9550 installed.