This is interesting, i am looking for similar information but i have a problem. according to my Service Tag( and the sticker on the case) on Dells site i have a Optiplex 760. when i do the CPU Z check it shows a motherboard type of 0DG284, which according to sites is for a GX270. but my mother board only has 3 AUX slots whereas that mother board has 4. the number etched onto the board is E93839 GA0402 and that board was used in the Optiplex 780 machines. finally when i do the detect from Dells site it comes back with a completely different service tag and express service code as well as a different model of desktop. My board is definitely an E93839 GA0402 and i have an Intel Pentium 4 CPU @2.8Ghz. i still am wondering what would be the fastest processor i could upgrade this to. the machine is in great shape still.
thanks
cdr