I currently use an Alpha 6035 heatsink with a Thermaltake 6025A-2B 60mm fan on a 1.4GHz Athlon. I usually run the chip around 1.5GHz. I just ordered an Athlon XP 1900+ from Thompsons Computer Warehouse. Will my present HS/F be sufficient for my new CPU -- which I'll overclock -- or should I upgrade? If an upgrade is in order, what do you recommend?