I overclocked a Pentium 4 641 (best Pentium 4 series) to 4.5GHz. It still was slow. A Pentium D might have an extra real core to replace the Hyper-threading, but it's still going to be slow, and consume more power and put off more heat. As was said, a Pentium D is nothing more than two Prescott cores put on one chip.
A Pentium Dual-core is actually a Core 2 Duo with less cache/FSB/clock speed. Overclocking can take care of the latter two. With a decent enough board/RAM, most (I'm talking about E2xx0s here; the E5x00s go higher) go to ~3GHz with relative ease. Going higher is where it starts getting harder. My E2160 ran at 2.7GHz for well over a year, and that was on stock cooling with a cheap G31 board. It did 3GHz stable as well, but I left it at 2.7GHz.
Originally Posted by linkin93
Pentium D is Dual core pentium 4 - Pentium Dual Core is Wolfdale based 45nm
Not all of them are Wolfdale. The E2xx0 series is Conroe-based (65nm), and the E5x00 series is Wolfdale-based (45nm).Edited by Princess Garnet - 10/22/11 at 1:23am