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<p>I think you are a little confused. Intel makes three general families of processors:</p>
<p>Celeron: this is the low-end slow chip, used in very inexpensive desktop (and maybe notebooks).</p>
<p>Pentium 4: this is the fast chip, used in faster desktops</p>
<p>Pentium 4M and Pentium M: These are the Centrino chips, designed for laptops.</p>
<p>People get confused because the Pentium 4 chips run at 2.6 to 3.6 mHz clock rates, while the Pentium Mobile chips run at 1.6 to 2.0 mHz, so they assume the Centrino Pentium M chips are “slower”. But, in reality, Intel has redesigned the system architechture to run more instructions per clock cycle so that the “slower” clock speed Centrino chipsets are actually faster. </p>
<p>The Pentium 4 desktop chips are big power hogs. They are only capable of an hour or two of battery life and they generate massive amounts of heat. This is a big problem in the tight confines of a laptop. </p>
<p>The Centrium Pentium 4M and Pentium M chips generate much less heat and provide 3 or 4 hours of battery life.</p>
<p>As far as I can tell, all of the Dell Latitude notebooks use the Centrino Pentium M chips, except the el cheapo model that offers a choice of a Pentium 4 or Celeron processor.</p>
<p>Hyperthreading is available on a number of the Intel chipsets. It does simulate the speed of a dual processor system. As a practical matter, it is pretty irrelevant on the most commonly used software. For example, enabling hyperthreading slows down Microsoft Word and Excel. It does provide a modest improvement on some of the complex filters in Adobe Photoshop.</p>
<p>Anyway, to recap: AZ is correct that the latest Pentium 4 is the fastest available processor for a desktop workstation. However, Pentium 4 chips are lousy in notebook due to the extreme heat they generate and excessive power consumption. The prefered notebook setup is Centrino technology with a Pentium M processor. These are still very, very fast computers, not quite as fast as the desktop workstations. However, the slight reduction in speed is more than offset by a notebook that will actually run on a battery for long enough to watch a movie and won’t cook from the heat.</p>
<p>Mini: The main advantage to buying the brand that the college has a deal with is from the service end. The college has “premium” vendor status, meaning that the IT department serves as a factory authorized warranty center, with special phone numbers for ordering parts.</p>