OK, I've got both a uMBP 5,1 and a new 21.5" iMac. I want to upgrade the RAM on the MBP. I'm pretty certain that the two use the exact same RAM. This stuff in particular: Newegg Just want to be absolutely certain this RAM will work with my machines; I'm hoping to put the 2x1 GB pair that's in the MBP into the iMac so I'll have 6 GB. Again, I've found nothing to say that it won't work, but just want to be certain.