The Pentium 4 660 is at the top of Intel's 64-bit family line if we don't consider the existence of the newer Extreme Edition series at 3.73Ghz. After all the tests we did, we can say that the Intel CPU is recommended mostly for Video compression or DivX conversion and audio encoding, especially to the WMA format. The performance of the 660 during all the benchmarks we ran was very good in all tasks. However, MP3 encoding or compressing files with WinRAR is still best with the AMD. Game performance with the Intel 660 is also very good although it still lags behind compared to the AMD processors.

This CPU is more suitable for a high-end system. In our opinion, the choice of the 640 seems more logical. The value of the 6xx series, as it was expected, is higher than the 5xx series, $615 for the 660 and $410 for the 560 for example at Newegg, both at 3.6Ghz. It also falls between the cost of the AMD 4000+ and the FX-55. However, $615 is a lot and for this reason we should not forget the new dual core series that was recently released on the market. So, before upgrading your system with a 6xx processor, it may be prudent to wait for a while.