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

110 MIKE MEYERS’ A+ CERTIFICATION PASSPORT

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

Travel Advisory

What makes a dual-core CPU better than a hyper-threaded CPU? The hyper-

threaded Pentium 4 shares a single ALU but splits out the FPU for multiple threads.

If two processes both need the ALU, then the hyper-threading

doesn’t do much. A dual-core CPU has two distinct processors

and could handle multiple processes more efficiently.

Mobile CPUs

The inside of a laptop PC is a cramped, hot environment, where no self-

respecting CPU should ever need to operate. Since the mid-1980s, CPU manu

facturers have endeavored to make specialized versions of their processors to

function in the rugged world of laptops. These are called mobile processors.

Over the years, a number of CPU laptop solutions have appeared. Virtually

every CPU made by Intel or AMD has come in a mobile version. You can usu-

ally tell a mobile version by the word mobile or the letter M in its name. Here

are a few examples:

•

Mobile Intel Pentium III

•

Intel Pentium M

•

Mobile AMD Athlon 64

•

AMD Turion 64 (All Turions are mobile processors but don’t use

mobile or M in their name. AMD usually adds mobile technology as

part of the Turion description.)

•

Intel Core Duo (a dual-core CPU)

A mobile processor uses less power than an equivalent desktop model. This

provides two advantages. First, it enables the battery in the laptop to last longer.

Second, it makes the CPU run cooler, and the cooler the CPU, the fewer cooling

devices you need.

Almost every mobile processor today runs at a lower voltage than the desk

top version of the same CPU. As a result, most mobile CPUs also run at lower

speeds—it takes juice if you want the speed! Mobile CPUs usually top out at

about 75 percent of the speed of the same CPU’s desktop version.

Throttling

Modern CPUs have the capability to reduce their processing cycles and lower

their clock speeds when they reach a certain temperature; this feature is called

throttling. This is incredibly important with mobile processors because the heat

dissipation method for portable PCs is wimpy compared with that of desktop

PCs. It’s also essential when you have a catastrophic fan failure—either through

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