Archived news: October 2007 - December 2007

• Level 2 cache on the Celeron processors is only 256 KB, that is twice smaller than on Pentium 4 CPUs
• Mobile Celerons do not include SpeedStep technology
• Deeper Sleep power-saving mode is not supported by Celeron Northwood microprocessors.

• Mobile Pentium 4-M Thermal Sample in FC-PGA package.
• Engineering sample of Mobile Pentium 4-M 1.2 GHz - that's 200 MHz less than the slowest production Pentium 4-M processor. This is not the slowest Pentium 4-M ES though - Intel also made 1.1 GHz samples.
• Low voltage Pentium 4-M. Intel doesn't have any information about low voltage Pentium 4-Ms on their site, and I doubt that these microprocessors went into production.
• Mobile Pentium 2.4 GHz with HyperThreading Technology. This Mobile Pentium 4 is 400 MHz slower than the slowest production Mobile Pentium 4 with Prescott core.

Pentium M is a family of high-performance microprocessors that was designed specifically for mobile applications. This was quite different from how other Intel CPU families were designed. The primary goal of all older CPU designs was to deliver maximum performance, which in many cases was done at the expense of higher CPU power consumption. Once the new family was designed, the company would modify the design for lower power consumption by lowering core voltage or adding special features, such as SpeedStep technology and additional power saving modes. That didn't work well in some cases. Take a look, for example, at Intel Pentium 4 "mobile" processors - these processors have Thermal Design Power in the range from 60 to almost 90 Watt, that is from 2.4 to 3.6 times higher than Pentium M. Pentium M achieves much lower TDP by using more efficient (per clock) micro-architecture, low operating frequencies as compared to Pentium 4 CPUs (power consumption increases linearly with the increase of CPU frequency) and many power-saving features.