Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Here's some good info:

http://eshop.macsales.com/shop/Memory_Benchmark/Apple_MacBook/

This looks like the best deal. There are several MacBook owners' compliments on the page. I just placed my order:

http://www.newegg.com/Product/Produ...SelectedRating=-1&PurchaseMark=&=0&=100&Page=

Well, I just installed my 4GB ram from NewEgg for $79.99 with free shipping into my May 2007 MacBook 2 ghz Intel Core 2 Duo which is supposed to have a max memory of 2GB and here's the result:

picture1kr4.png
 
Well, I just installed my 4GB ram from NewEgg for $79.99 with free shipping into my May 2007 MacBook 2 ghz Intel Core 2 Duo which is supposed to have a max memory of 2GB and here's the result:

Regardless of what it says, it only addresses the first 3gb.
 
Regardless of what it says, it only addresses the first 3gb.

I realize that. But:
NOTE: A 4.0GB (2GB x 2 Pair) configuration was also tested by 'popular demand'. Although the Core 2 Duo Macs are limited to 3.0GB addressed, the 4GB Set (2GB x 2 Pair) does appear to enable 128 Bit addressing. While there does seem to be a small performance benefit gained with the 4.0GB vs. 3.0GB config, we'd recommend sticking with 3.0GBs max (in Core 2 Duos) unless you absolutely are seeking every last trickle of performance boost possible.

http://eshop.macsales.com/shop/Memory_Benchmark/Apple_MacBook/

4GB for $79.99 total, was the best deal that I could find. The additional cost for 4GB (Two 2GB sticks) instead of 3GB was negligible.

http://www.newegg.com/Product/Produ...SelectedRating=-1&PurchaseMark=&=0&=100&Page=
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.