The 4GB of Mushkin memory that I ordered from NewEgg arrived today, so I immediately swapped the one stick of 1GB that was in the MacBook with 2x2GB sticks. Ever since the underside of the MacBook has been much hotter than they usually are. I'm not really sure if its the RAM, or if I'm just being paranoid, but now there are moments when I can't even put it on my lap (I've never had this problem before). I'm not really doing anything that requires a lot of RAM yet. I opened PhotoShop to check it out, but I quit it hours ago. Right now I have Safari, Mail, Adium, and iTunes opened. Can the RAM make the system hotter or am I just being paranoid?