The "Upgrade" of my topic?

I'm the first to open an Air Cooling thread database here
I've managed V1 & V2 of Air Cooling Database until i've lost the time to handle the database since i'm busy with my business nowadays.

Ignore that, it doesn't matter if you use a 2.8GHz or a 3.2GHz processor.
If it's made Socket 478, then it's bound to fit in all Socket 478, no matter what speed you use.

If you can find used Thermalright XP-120, then that's the best heatsink for Pentium 4 Socket 478 processors.

Different brands, different company.
It has no similarities.

Thermalright XP-90 is also good.
The only downside of XP-90 is you can only use 90MM fan.

Remember this fact, the smaller the fan, the noisier they are.

I suggest you buy this:
http://forum.lowyat.net/topic/1527622

Thermalright SI-120 may not be as good as Thermalright XP-120, but it performs better than Thermalright XP-90.
Plus, you can use a 120MM fan on it, better airflow, lower noise.

You don't have to buy a high speed fan for it, just low speed would be good enough.

Also, don't even bother buying that Zalman CNPS 9500, it's crappy.
I know a lot of Zalman fanboys wouldn't agree with me but to me, all Zalman heatsinks is crappy.