about cpu

Question

What is x86? What is 64bit or 32 bit??

Answer 1

x86 or 80x86 is the generic name of a microprocessor architecture.
It has dominated the desktop computer, portable computer, and small server markets since the 1980s IBM PC.

The architecture is called x86 because the earliest processors in this family were identified by model numbers ending in the sequence "86": the 8086, the 80186, the 80286, the 386, and the 486.

64bit or 32 bit??
32bit indeed...mainly 32bit
Core2Duo and PD are also from the tree of x86, they are some 64bit and 32 bit/ 40bit..

EM64T
x86-64 is a 64-bit microprocessor architecture and corresponding "instruction set" only!!
http://en.wikipedia.org/wiki/EM64T

Intel introduced the IA-64, a separate 64-bit architecture used in its Itanium processors and Itanium Processor Family (IPF). IA-64 is a completely new system that bears no resemblance to the x86 architecture.