If you already have the Tbird 1.4, I wouldn't bother with an upgrade. I've had a Tbird @1500MHz, Morgan at @1370MHz and now XP @1800MHz, and other than the misleading 3DMark getting a nice boost, all of the above were relatively close in performance for desktop apps and gaming. If you need to buy another cpu, grab the XP1600+ for $53 shipped with AGOIA-Y stepping, it will probably hit a 166MHz fsb (1743MHz) at default voltage.