Architecture Type

Processor chunk size

32-bit registers

64-bit registers

128-bit registers

Amount of RAM supported

x86

(Intel and others)

32

8

(General purpose)

8 (floating point)

8 (SIMD)

4294 MB

DEC Alpha

32 (integer)

32 (floating point)

AMD64

(AMD)

EM64T

(Intel)

64

16

(General purpose)

8 (floating point)

16 (SIMD)

1 TB

IA-64

(Intel)

128 (General purpose)

128 (floating point, 82 bits)

PowerPC (IBM)

16

(General purpose)

16 (Velocity engine)

8 GB

Ultraspac (Sun)

128 (General purpose)

MIPS

32 (General purpose)