The Socket A CPU, the main risk is actually chipping the open core, plus the usual one of screwdrivering the motherboard tracks.
I had over 70C on an Athlon it didn't die, and it didn't beep - if the BIOS is set to alarm at 60 and shut down at 70, I'd up it to alarm 70, shut 80, or even 80/90.
I've also fiddled with S2Kctl (puts an Athlon into low power disconnect when idle, but stresses the transient response of the regulators to the point of instability on some motherboards and RMClock from CPU Rightmark.
I replaced a no-name cooler with a Thermosonic V60-4210 - and I got a spare Arctic copper silent 2L (very cheap, for one that includes a backplate-mounted high/medium/low switch) for a spare... I'd say that is worth looking at, as you can tailor performance/noise using the switch
http://www.ebuyer.com/customer/produ...duct_uid=87736
Also worth a look, a prime example of the ever-popular "wedge" profile, which matches an 80mm fan to a heatsink that's less likely to foul motherboard components - and with free shipping, it's a bargain!
http://www.ebuyer.com/customer/produ...duct_uid=55761
And another, though check the reviews, some say this is a monster that DOES foul components, though it's another wedge profile.
http://bigbruin.com/reviews/silent2l/
According to this, Low is for up to 2500+, and Medium for up to 3200+
Looks like it would need to be on high, if you have a cooling problem, as it does not have the same perfomance as the "luxury" models
http://www.systemcooling.com/arcticcooling_cs2l-03.html