Monday ordered, received Tuesday * 5 *****
Have the memory in my iMac 21.5 "(Middle 2010) Intel i3 3,06GHz installed and the original 4GB left in it, thus resulting 12GB memory.
In Mac OS X Lion 10.7.2. No problems.
Have let Pro (version 6) through a 90-minute memory test with TechTool, this was passed with flying colors and full marks.
LION runs very smoothly, have many apps and programs run parallel + Windows7 under Parallels ---> everything is super. (Was a problem with 4GB RAM)
Thus, I think that I will get no problems in the future.
So memory "mix-Impossible" ????
NO, 4GB Original Samsung 1333MHZ DDR3 RAM + 8GB 1333MHz these CORSAIR DDR3 RAM -> NO PROBLEM !!!!
Now have 12GB RAM :)