Ok so my brother just got a 13 MBP 2.26. He wants to upgrade the RAM to 4GB. He used a gift card to buy the following: KINGSTON KTA-MB1066/2GR @ a rip off price of $124!!!!!! but since he had a $150 gift card he did it. Now he has a friend that bought the same exact RAM as above and gave it to him. He now has a total of 4 GB of RAM. Will this run in Dual Channel? I'm not sure but he said they are identical just not bought as a "kit" I told him to return it as he could get Crucial 4 GB kit for $115!!!!!!