Hello all, I am upgrading the ram in my MacBook Pro, from 4GB (2X 2GB) to 8GB (2X 4GB) In my iMac I have 4GB (2X 2GB) with two additional slots left over. I want to place the 2X 2GB from my MacBook Pro, in to the empty slots on my iMac, making a total of 8GB. They all have the same specifications, however I believe the two in my iMac are by Elpida and the two from my MacBook Pro are Hynix. By using two different brands will this cause any problems? Thanks in advance for your help.