Quite a bump over your old system, huh! I know what you mean by the fan noise, I run Delta's on all of my personal rigs. They scream at 7000rpm and around 43db or more.......
Drives ya nuts after a while!
Shoot, you could leave it at 1.4 and not really need much more power.....
My XP1700+ will run at 2000+ speeds, but why do it? My modem takes a dump over 150FSB so I'm limited by it, so I've been thinking of backing things down to "normal", but then I probably couldn't live with myself!!!
Congrats dude, sounds like a nice rig!