No Intel Pentium 4 processor was ever manufactured running at a clock speed of 500MHz. However, the previous product line, the Pentium III, had several variants running at that clock speed.
The fastest "classic" Pentium is clocked at 200 Mhz. The fastest Pentium with MMX extension is clocked at 300 Mhz. The fastest Pentium II is clocked at 400 Mhz. The fastest Pentium III is clocked at 1.4 Ghz. The fastest Pentium 4 is clocked at 3.8 Ghz. The fastest Pentium D is clocked at 3.7 Ghz. The fastest Pentium M is clocked at 2.26 Ghz. The fastest Pentium Dual-Core is clocked at 2.5 Ghz.
No, you cannot.
They are no longer manufactured.
As a whole, the Pentium 4 has a higher maximum performance than a Pentium III. The Pentium III performs the same as or better than Pentium 4 at the same clock speed, but the Pentium 4 has a higher max clock speed (which the Pentium 4 was designed for).
Series of processors / Generation of Pentium processors.
Intel Pentium processor
Both processors are in the Pentium Dual Core family. The Pentium Dual Core E2200 is better than the other.
The Pentium 166mhz is a old socket 7 a very early Pentium prossessor,The Pentium 4 is modern form factor,much faster and more prossessor cach than the old chips.
The Intel Pentium D, Core Duos (and Solos), Core 2 Duos (and Quads), Pentium Dual-Cores, and the Core i7.
That would require purchasing a new motherboard, processor, and power supply.
No. The Intel Core 2 Duo is much faster than the older Pentium 4.
Celeron doesn't refer to any particular processor series. Celerons were cost-reduced versions of their Pentium equivalents. The Celeron in question could be based on a Pentium 2, Pentium 3, Pentium 4, Pentium D, or Core 2 Duo. In which case the answers would be "Pentium 3, Usually Pentium 3, Celeron, Celeron, and Celeron", respectively.