The P4 is really a 100 Bus.....(times 4 thax to Rambus)
The Athlon C is really a 133 Bus....(times 2 thax to DDR)
Funny, that you don't hear too much about that compairson. You don't want Rambus, it has more faults than benfits. Looks good on the benchmarks and on paper, but not so good on actual applications.
As far as your question....I don't know...try searching the forum for other threads on the subject, your bound to find one.
That Athlon really is a monter
But I heard somewhere about a HyperTransport Technology that will speed up thing quite a bit, so it's advisable to wait a while longer to upgrade the computer and buy a mobo with that tech.