Hmm, 2.1GHz I think. That would be the 2166MHz one.
Centrino isn't the CPU name, it's the Pentium-M. Centrino is a package that includes the Pentium-M and a wireless solution.
Pentium-M offers up to 2/3 increased battery life! Unfortunately most manufacturers assume that means they can use a smaller battery. But at least the smaller batter reduces weight.
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My 1.4 GHz Pentium-M is faster than my brother's 2.4 GHz Pentium 4 at software 3D rendering. It's equally fast at compiling. But it's slower in other tasks that require high memory bandwidth, although that might also be caused by the slow laptop disk.
Either way, a 1.5 GHz Pentium-M could hardly dissapoint you. Even Dell prefers the 1.7 GHz Pentium-M in their high-end desktop replacement and workstation notebooks instead of the 3 GHz Pentium 4...
Don't forget the Pentium-M has a 1 MB L2 cache and 32+32 kB L1 cache! The Pentium 3 (Tualatin) has only 512 kB L2 cache and 16+16 kB L1 cache, and Northwood has 512 kB L2 cache and 8 kB L1 data cache and 12 kuops trace cache.
So even though the Pentium-M has a Pentium 3 core, its cache configuration makes it far superiour. So compared to a Pentium 4 it has a much higher efficiency than just the IPC difference with Pentium 3.
A Centrino with clock rate X is probably enough to make a 1.5X-clocked pentium 4 look small... So the 1.4Ghz P-M should outperform at least a 2.1Ghz P4, and a 1.7Ghz should outperform a 2.5Ghz P4 or so... Roughly speaking. These are great processors! :smile: