This is the fast pentium out now, this is a Pentium 4 running at 3.4 GHz and a 800 MHz front side bus. It is an extreme edition with Hyper Threading technology, which a lot of pentium's have now. This procssor is not a 64-bit processor but is still mega fast it could run circles around a Mac G5 processor. When this processor first came out it was over 1000 dollars but not the price is only about 500 dollars, which is a very big difference.

This is a pentium 3 processor which was the version of the pentium before the pentium 4 came out. Even know this is a pentium, it is probably not faster then most newer celerons. This is because the pentium 3's have older technology and the new celeron's have newer and faster technology. This is still a good processor but it is a little out dated. I would not recommend buying one of these if you dont all ready have 1 because you can get a newe celeron for around the same price.