I want to upgrade my xps400 from the 820d dual core pentium to the e2200 core2duo. mobo is probably locked at 800mhz fsb by the bios. Im thinking that this is probably the only core2duo upgrade i could make with the fsb speed and same socket arcitecture.... for about $40.00-50.00  Has anyone done this? Or is this not feasible? This was a 2005 xps400 model.