You can"t be too careful when it comes to cooling. I found that most quality HSF will do the job. I have a 1.4 Ghz 266 Athlon
running o/c at 1.53. What I did was buy three of the popular
HSF and tested each one on the system running 3dmark 2001.
The results follows:
GlobalWin WBK-38 @ idle- 42 / after 3dmark 2001- 50
Thermosonic ThermalEngine @ idle- 41 / after 3dmark 2001- 48
Vantec CCK-6035D @ idle- 38 / after 3dmark 2001- 44
As you can see, any high quality fan will get the job done. Also,
the Vantec (which I now run) shows the benefits of a copper
heatsink/fan combo. Also if your Bios support it, set a reasonable shutdown temp. in case the fan ever craps out. It can happen.
It is also a good idea to have a fan blowing out the back of the case. I (like Akash) believe in cooling. I have an Antec 1030 file server w/ 2 fans in back, 465 watt Enermax whisper w/2 fans,
Harddrive heatsink w/ 2 fans, Soyo dragon plus w/fans on chipsets(came stock w/1, I added the second), Radeon 8500 w/
aftermarket heatsink/fan combo😱