The only difference I've heard is that the Prescott has 1MB of L2 cache as opposed to the Northwood only have 512KB L2 cache. I've heard that the extra L2 cache doesn't improve performance for the Pentium 4. I'm looking to buy a new Pentium 4 CPU as my current P4 may be the reason for random system reboots and BSODs I've been having, so I would like to know what would be better to go with when both are around the same price?