the 2600+ is 333FSB, the 3000+ XP has 400FSB but it has to be the barton core, this one:
That's the great thing about the XP-Mobiles with the barton cores, they have 512kb L2 Cache just like the 3200+ and at stock it's only 266FSB but they are easily overclockable and with the right motherboard then you can make it 400FSB and OC it much faster than the 3200+ XP and the chip is half the price.
do ya reckon it would run ok with 80 gig hDD 1024 DDR 400
Well anything within the boards range will run 'ok' with it, but for optimum performance if you have DDR400 memory then you'd want a 400FSB CPU so that your CPU and RAM are running at a 1:1 ratio which means they are communicating at the same speed to each other. Whereas if you had a 333FSB CPU combined with DDR400 RAM then you'd have a bottleneck and it's decrease overall system performance.
You could always underclock the DDR400 to DDR333 with tighter timings and that'd give you better performance than leaving the 400 at 400MHz and with it's stock timings.