The Intel® Pentium® 4 506 Processor is based on 90nm technology, sporting the Prescot core on the LGA775 package. As many enthusiasts will noticed, this processor core is not the latest release, in fact, it's been in the market for quite a while. However this is also the very reason to have a look and see on how this core matures and performs under overclocking stress.
Primarily geared on the mainstream market, it is designed to deliver performance across usages—such as image processing, video content creation, games and multimedia—where end-users can truly appreciate the performance. It has great features for digital home computing, such as support for EM64T to enable the system to address more than 4GB of system memory and advance security functionality thru Execute Disable Bit that can prevent certain classes of malicious "buffer overflow" attacks when combined with a supporting operating system.
Source:Overclocking the Intel® Pentium® 4 506 Processor