Member Rara Avis
Did you say 1.4 GHz, Chris? Don't tell me you're traveling the middle of the road these days?
The new Pentium 4 comes in three speeds: 1.3, 1.4, and 1.5 GHz, with a 400 MHz system bus and the new (very fast, VERY expensive) RDRAM. I bought one (the 1.3) for my birthday. It screams!
As for your AMD question, I did a lot of investigation when I was shopping for Athena. Software compatibility is near perfect, and pound for pound (or MHz for MHz) the AMD is significantly faster than the Intel. It is not as upgradable, as you indicated, nor does it support SMP (dual processors). The biggest problem, however, and the reason I went with Intel, is memory. According to my sources (who build hundreds of PC servers a year), the AMD motherboard sporadically chokes if you go over 512 Meg. For a personal system, that's rarely an issue, but for a server (either web or LAN) it can be big issue.