There are various types of processors. New and faster types are released every year. Each processor type also has several different subtypes, referred with a number representing the speed. There are several companies that produce these CPU chips. All pentium class processors still are compatible with this chip.
Every new type has more advanced features and new capabilities.
This company started producing x86 compatible processors in the early nineties. Although their design is different, these chips are fully compatible with x86 software, such as Windows 95, MS-DOS, etc. There are differences regarding performance and prizes however. There are also other computersystems, with other CPU producers. As each individual producer has its own design, the processor is also different on the outside.