Engadget has published an interesting article that claims there are issues with the MacBook caused by installing 4GB of RAM. There is also a growing number of complaints about various video problems with the NVIDIA 9600M GPU used in new MacBooks:

While most of the complaints about the new MacBooks and MacBook Pros have focused on things like the screen or the absence of a certain much-loved port, it appears that another problem has been bugging some folks that went ahead and maxed out the RAM on their shiny new laptop. Apparently, loading 4GB of RAM (either from Apple or a third party) has caused at least a few MacBooks and MacBook Pros to freeze up randomly which, for the time being at least, can only be remedied by dialing things back to 2GB or 3GB of RAM (something tested by jkOnTheRun). While Apple isn't saying anything publicly about this just yet, one member of the Apple support forum claims to have heard from an Apple engineer who says that Apple is, in fact, aware of the problem and that a software update is on the way to fix it, possibly within a few days.

In related MacBook news, The Inquirer is now reporting that the new MacBook Pro's NVIDIA 9600M GPU suffers from the same so-called "bad bump" problem that has plagued previous generation MacBook Pros (and provided plenty of fodder for The Inq) which can, in some cases, lead to blank screens and other video errors. It's not clear, however, if the problem affects all MacBook Pros or just a bad batch, although there does appear to be a somewhat sizable number of complaints cropping up.