hi there.. just wanna some opinion... i'm aiming for 12gb of ram.. I just upgrade my imac 2010 with 2x 4gb ram from kingston.. when i install the with the original 2x2gb samsung ram, my system will hang... all the specs is the same.. original ram also clocked at 1333mhz and same as the kingston.. But if i just install the new ram, everything run smoothly... now stuck with 8gb only.. can someone explain what happen..?