"Correct on all points. 1400TB's are pretty hot cpu's. The last one I put together I added a copper core AMD XP 2500-3200 HS/Fan with Arctic Silver 5 Thermal paste. The cpu runs under load around 45C, idle 39C."
From some other forum --^. Thats with a very good heatsink that the other forum guys got so, 50-60 for yours is fine, obviously in the 40's would be better but you've got nothing to worry about. Those chips are rated at up to 90*C so its fine unless youre having stability problems or somthing.