New Macbook 13" 2.26 or 2.54

Is there going to be a noticeable difference between the 2 cpus? I already have a 320GB 7200 RPM drive to put in. I was thinking to just order the 2.26 version and upgrade to 4GB ram ($90 from apple). Seeing as both models have the backlit keyboard and everything else is basically the same. So essentially i need to decide is $210 ($300 - 90 for ram) is worth it just for the cpu.

EDIT: Anyone know if the hard drive is as easy to change as the previous unibody. Not sure now with no removable battery.

Eidorian said:

Only get more CPU power if time is money for you. Sadly in most cases it can be boiled down to seconds of gain.

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That is what I figured, while deep inside I want to spend the $ to get the latest model (the sickness in me 😛) It seems to not make sense since everything else is on par. I just really want to make sure i can upgrade the HD myself.