Processors and Their Data Bus Widths

Processor ----------------------------Data Bus Width
------------------------------------------------------------------
8088 -------------------------------------8-bit
8086 -------------------------------------16-bit
286 ---------------------------------------16-bit
386SX -----------------------------------16-bit
386DX ---------------------------------- 32-bit
Pentium/AMD-K6---------------------64-bit
Pentium Pro/Celeron/II/III---------64-bit
AMD Duron/Athlon -------------------64-bit
Pentium 4 -------------------------------64-bit
Itanium----------------------------------64-bit
Xeon--------------------------------------64-Bit
Atom-------------------------------------64-Bit
Dula Core ------------------------------64-Bit
Core 2 Duo-----------------------------64-Bit
Core 2 Quad ---------------------------64-Bit
Core 2 Extreme------------------------64-Bit
Core i3-----------------------------------64-Bit
Core i5-----------------------------------64-Bit
Core i7-----------------------------------64-Bit