Pentium 4
Introduced during end 2000 had 1.4 and 1.5GHz clock rates, featuring the NetBurst micro-architecture. Firstly, a 400MHz system bus (FSB) came in and later on this evolved to 533 and 800MHz.
Contained 42 million transistors. It was initially built with 180 nanometers process technology and then moved on to 130 and 90.
The first chipset for Pentium 4 supported Rambus memory only; whereas the chipsets that followed supported the more common DDR SDRAM.
