This is the last upgrade for my old P4 desktop. Since my friend Forrest bought it in May 2004, it has been more than 5 years now. Basically excepts for motherboard, all of parts inside have been replaced, harddrives, video card, memory, even CPU. Before it was a celeron, later last year I have bought from ebay a P4. It is much better than Celeron, and also much much hotter than Celeron. To cool it, the CPU fan just keeps a very high speed. As a result, it sounds like a grass mower when it is running (it was my mum-in-law’s opinion). Sometimes I need download something at night to take advantage of off-peak downloading quotes and my PC is right in my bedroom. You can imagine what a nightmare I have been through those days. Finally I decided to spend more money on it and it will be the last time!!! After doing research, I chose Zalman CNPS9500A LED, which is a Korean brand. Zalman has some patents to manufacture its fans and other products. Some people claim Zalman is the top level brand in this area.
As CNPS9500A is a little too old in this market, it is not very easy to find online with reasonable price. But I did find more than four sources, including one online shopper in my suburb. Eventually I have been to Shop 1, 89 York Street to buy it during my lunch break. After discount, it costed me $75, which my supervisor reckon I was wasting money. That was Thursday, we firstly went to Superbowl to play bowling rather than stay home fixing my desktop. After 4 games, we headed toward home.
Firstly I didn’t think it was so hard to put on a CPU fan. I read the manual thoughfully. Removed my old CPU fan, which is AN INTEL. When I tried to put it on I realised it was impossible as the heatsink of motherboard was too close to CPU so that it blocked the way of Zalman heatsink clip. There are two screws for this motherboard heatsink. To put my Zalman on, I had to take off that thing. After that it was pretty easy to clipped it. I was so happy to watch it shining with blue led lights when it was on. Before I closed my case side cover I was so upset to realise that the fan was put on in a wrong direction. Air flow supposed to blow to the rear hole of the case, but it was put on by me to blow opposite to my harddrives 
Anyway, it was tested very good, very quiet, very efficient. It keeps my CPU temperature alwasy around 42 degrees even after running more than 3 hours (I used Speedfan 4.34 to monitor it, a very useful freeware. You can click this link to download it from my SkyDrive).
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