In the past Intel used the name Pentium for the high-end CPU's and Celeron for the lower-end market. With the introduction of the Core 2 Duo Intel didn't use Pentium for the high-end market. After a while budget versions of the Core 2 Duo appeared with the name 'Pentium Dual-Core' which is like this CPU .

Basically it's just a Core 2 Duo with less L2-cache, slower front-side-bus (FSB), no Virtualization Technology nor Intel Speedstep for energy saving.