If depends on what you use your laptop for. Doing one thing at a time? You may not notice so much. Running multiple applicatoins or some games, you may notice. For 100 bucks it's a pretty good upgrade.
I'm in the market for a new laptop, and I have two options. The laptop has 2.0 GHz 800 MHz, but for an additional 100 dollars, can be upgraded to 2.40 GHz 1066 MHz. I understand that the second one will be faster, but the question is, how much faster? Will the increase in speed be very noticeable or just slight? Thanks to anyone who can help.