Manufacture

• The Intel Celeron M 420 and AMD Mobile Sempron are single-core CPUs. This means that each computer chip has one processor unit. The Celeron M 420 -- along with the Mobile Sempron 3600+, 3800+, 4000+, SI-40 and SI-42 -- uses the 65-nanometer manufacturing process. Three Sempron laptop chips -- the M100, the M120 and the M140 -- use the 45-nm manufacturing process instead, thus making them smaller processors than the others.
  
  

Speeds

• Each Celeron and Sempron mobile CPU has a clock speed and data transfer speed. The former refers to the rate at which the processor executes its basic functions, while the latter stands for the rate at which it connects with the motherboard for data transfer. The Celeron M 420 has a clock speed of 1.6 GHz and a data transfer speed of 533 MHz. The Sempron laptop CPUs offer a clock range of 2 GHz to 2.2 GHz. The Sempron mobile processors' data transfer speed is split between 800 MHz for the Mobile Sempron division, 1.8 GHz for the SI series and 3.2 GHz for the M series.
  
  

Cache

• Each Intel Celeron M 420 and AMD Sempron chip has two caches: a Level 1 cache and Level 2 cache. These are small memory banks that the CPU depends on for speedy delivery of computer data. Intel records the L2 cache of the M 420 as 1 MB. Apart from the Mobile Sempron 3600+ and 3800+, which provide 256 KB, each Sempron laptop CPUs offers a 512-KB L2 cache.
  
  

Power Consumption

• The Intel Celeron M 420 has a peak power consumption rating of 27 watts. The Mobile Sempron 3800+ and 4000+ are less energy efficient than the M 420 at 31 W. However, the other AMD Sempron laptop chips are more energy efficient, since they consume up to 25 W.