Technically it is a 45nm Dual core Wolfdale CPU from the Penryn Family.
The full Wolfdale has a 6Mb L2 cache and this variant is labelled a "Pentium Dual core or later Pentium" as it has only 2Mb of L2 Cache ... but architecturally it is a Wolfdale CPU.
It runs at 2.7Ghz under load but when idle, SpeedStep slows the CPU down to 1.7Ghz (drops X to 8.5).
I should add these are monster overclockers - just dial the FSB in the bios from 800 (200) to 1066 (266) and reboot @ 3.59Ghz ... should run without even overvolting it.
3.6Ghz dual core is no slouch ... makes a cheap little gaming rig ... with a decent graphics card.