Intel has a wide range of CPUs in its past and present lineup, and it generated many flavors of Pentium before its general transition to "Core" technology. Pentium D and Pentium 4 are two examples.

Pentium 4 Origins

1. P4 was introduced in 2000. Its core clock begun at 1.3 GHz, it had a 400 MHz front-side bus and theoretically could go all the way to 10 GHz earlier than heat generation became impossible.

Pentium D Origins

2. Pentium D, temporarily, did not show until 2005. In dominant years, Intel had developed some considerably advanced architecture, like many processing cores on a single CPU chip and support for 64-bit directions.

Dual-Core Pentiums

3. Intel developed a "Pentium Dual Core" that was depending on their afterward "Core" technology, which was differentiated by lower power necessities and heat generation.

Compatibility

4. As Pentium D and Pentium 4 are unusual within, D variety is not friendly with older Pentium 4 motherboards, like Socket 428 and 478. But "LGA 775" Pentium 4 is friendly with Pentium D motherboards.

Performance and Price

5. As Pentium D has two processing cores, it is able of quick performance, but only when software is intended to identify and take advantage of many cores. So, Pentium D CPUs price considerably more, assuming you can find one for buy.