when did the 120nm technology came into being?
anyway, as beedubaya said, yes Cache increase does effects performance, as Cache is most expensive in Processor.
and 90nm means that you can embedd same numbers of transistors in same space, even expandibility. theorotically the 90nm yield helps minimizing the heat disapation, which Intel couldnt achieve due to current leakage which is still out of control. but AMD coming afterwards in 90nm wafer. have efficently controlled everything. other factors being IBM's SOI technology and blah blah.
wait for little time, as unlike Intel, AMD started thri processors from lower clock so that they can move upwards afterwards in 90nm wafer.
in 3-4 months time, they'll hit the 3500+ based on 90nm wafer. or more.
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"