I have a dell poweredge 600sc, it has a 2.8ghz 533mhz front size bus with socket 478. I want to upgrade my cpu and I know i can upgrade it to a 3.06ghz pentium 4, but thats as high as i found it can go. However, i found a mobile version that is at 3.33ghz 533mhz fsb with a socket type of 478 http://www.ebay.com/itm/Intel-Mobile-Pentium-4-3-33-GHz...
would this cpu work?
It depends on whether or not the motherboard would support it, which I don't know but it might very well not.
Also, just FYI, even if it could work, buying refurbished parts off EBAY can easily get you a DOA product, because of improper shipping, ect.
And Wikipedia seems to imply it wont work: http://en.wikipedia.org/wiki/Socket_478
"While the Intel mobile CPUs are available in 478-pin packages, they in fact only operate in a range of slightly differing sockets, Socket 479, Socket M, and Socket P, each incompatible with the other two."