Looking to upgrade my iMac 2.93GHz i7 mid 2010. I currently have the original 4GB installed. I am planning to keep that installed, for the moment, and add another 8GB. I have always just stayed with the RAM installed on previous desktops. Knowing that the Apple RAM is something like $400 what's the best after market RAM to purchase? also, should i just purchase 16GB of RAM and remove the original 8GB. i am planning on buying another iMac in the next month or so and would like to use that RAM as additional for the new iMac. Note to self...check that original RAM will work with new iMac. Thanks T