Hi guys I am going to max out my XW6200 I currently have one 3.6ghz CPU and I am going to upgrade it to two 3.8 ghz Xeon irnwindale CPU s (do they support multi threading?) just a quick question regarding the CPU itself as long as it is a socket 604 and 2mb cache and 800mhz bus does it have to be a HP cetified part or can I use other parts? Also does any one have any good ideas for a GPU I will be running windows 7/8 and adobe design suite and expression design. Thanks a lot guys ))