ZALMAN AMD Athlon/ Duron/Athlon XP Socket 462 CPU Manual de usuario descargar pdf (Pagina 10)

64-bit Processors

A 64-bit CPU has general-purpose, floating-point, and address registers that are

64 bits wide, meaning they can handle 64-bit-wide code in one pass—twice as

wide as a 32-bit processor. And they can address much, much more memory.

Both AMD and Intel currently produce 64-bit CPUs.

With the 32-bit address bus of the Pentium and later CPUs, the maximum

amount of memory the CPU can address is 2

(4 GB), as you know. With a

64-bit address bus, CPUs can address 2

bytes of memory, or more precisely,

18,446,744,073,709,551,616 bytes of memory—that’s a lot of RAM! This num

ber is so big that gigabytes and terabytes are no longer convenient, so we now go

to an exabyte (2

). A 64-bit address bus can address 16 exabytes of RAM.

The current consumer-oriented 64-bit processors are the AMD Athlon 64

family (Figure 5.6) and the Intel Core 2 family. Both are designed to run either

32-bit or 64-bit operating systems, so they support 64-bit Windows Vista out of

the box.

Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Chapter 5

108 MIKE MEYERS’ A+ CERTIFICATION PASSPORT

Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Chapter 5

FIGURE 5.5 Dual CPU Usage History graphs for a hyper-threaded Pentium 4

P:\010Comp\Passport\308-3\ch05.vp

Monday, April 09, 2007 9:29:44 PM

Color profile: Generic CMYK printer profile

Composite Default screen

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 25 26

Sin comentarios

ZALMAN AMD Athlon/ Duron/Athlon XP Socket 462 CPU Manual de usuario Pagina 10