Pentium d or pentium 4 is faster

Pentium D is a little bit better for multitasking and multithreaded applications since it has two physical cores since hyperthreading is not as effective in multithreading as true physical cores. For singlethreading applications Pentium 4 is a little bit better because of higher frequency. They are both slow by modern standards though.

Pentium D is better.

http://www.tomshardware.com/charts/cpu-charts-2006/benc...

Pentium D is better of those two.

Its like two Pentium 4 slapped on a single die,which will obviously perform better in most cases.