Thanks to 熙, this evening I also bought a Pal8942 Heatsink with Thermaltake Fan A1214 + an Arctic Silver3 Thermal Compound totaling NT2050 from Dracular. The installation process was basically very smooth, just followed the instruction and everything is done. The quality of Pal8942 heatsink is very good due to Japanese made, and the Thermaltake fan is pretty nice, too.
Before using Pal8942, all I can get from my system is FSB160 with the Intel fan. However after adopting Pal8942, my system still can't get any further no matter how hard I have tried. I set the CPU valtage to 1.75 V and kept the Ram setting default, it just wasn't stable while running WinXP. I thought it should have gone up to at least FSB175 before I bought 8942. As a result, I think the problem is due to my poor P4-2.26AG CPU (SL683 Malay L213B370-1384, don't buy this model), it just can't overclock above FSB160.
Well, I still love my new sink and fan, they really make my computer look more powerful although it's actually not.
Thanks to 熙 again for your recommendation.
How's your new P4b533? you mentioned you would buy one too.

p.s. sorry about my poor chinese typing. (English is faster for me)

Frankiekuo