why does it matter?, and how do those 2 choices differ?
also, why not consider the dual-Athlon or the 2Ghz P-IV?
from what I've heard, having a fast machine processes the responses from the Internet conection and forces the software (direct access software, charting software, email, web browser, etc) to respond far faster than on slower machines.
however, how are the other links in the chain?
internet conn speed? 56kb, 28kb, 112kb, faster??
direct access broker connection path?
data-feed connection path?
other site related connection issues?
what do you plan to use this platform for?