Summary: Good chip. Can be easily overclocked. Being overclocked allows my 7-year PC still be of use, to run virtualization software and do some testing for my SMB IT projects. Don't decommission your old P4-based PC, just upgrade it with Pentium D. Nowadays you can easily afford it, much cheaper than 5-6 years ago.
Summary: You gotta... GOTTA.. check compatibility with the board, but if your board will take this CPU, it is a dilly. I put this fan on the CPU and I did not have heat problems at all. http://www.amazon.com/Thermaltake-CL-P0497-Intel-775-Cpu/dp/B001CCGYU0/ref=sr_1_1?s=pc&ie=UTF8&qid=1338031432&sr=1-1 Intel stopped its drive to increase the speed of the old 775 CPU's because heat got in the way of data crunching. That fan seemed to do well.
Summary: If you're looking for an inexpensive way to start building your own computers and don't necessarily need the latest and greatest hardware (say for a childs computer) the Pentium D is the way to go. I got the Pentium D when it first came out and was upgrading from a Dual Pentium 3 1.0 ghz Processor. The jump in speed was amazing but also the stability of the processor amazed me.
Summary: Old tech, bought used and runs good. Only reason ease of use is still not so great is that you have to have aftermarket cooler to really max out this chip. Also, watch out for your mobo's limits as it's possible that your mobo can be a hindrance as well.
Summary: It is strange to write a review on a discontinued processor. But let me tell you that the new processor do not work as well as this processor does. It is because regular users do not know how to use the features of new processors, and as a matter of fact, very few people do. Just those who know how to squeeze the benefits of technology. This processor is used, in my case, for mathematical calculations, and no quad cores or core 2 duos do as fast as this old processor do.
Summary: This CPU I purchased was a great upgrade from my low end Pentium D I had before. My computer is just quick and nimble, it does everything very well I throw at it, from Bluray viewing, word documents, and downloading music, all at the same time! I even play graphic intensive games it does very, very well, of course paid up with a nice video card, such as my Nvidia 8800 GT.