Removing the two 1 GB DIMMs. These chips are a new RAM type for Apple, 1066 MHz DDR3 SDRAM.
Apple claims this machine maxes out at 4GB RAM, but the Montevina chipset appears to support up to 8GB.
Shameless plug: You can upgrade your existing MacBook or MacBook Pro to 4 GB. We'll also be offering the RAM for the new Unibody machines in the near future.