Hi all, I have an iMac (21.5 inch, mid 2011) with 4 memory slots, 2 has 2 GB each, is it OK to put a 4 GB in each of the empty slots or should I buy 4 new 4 GB and replace all, Sebastian Cheers

Hi all, I have an iMac (21.5 inch, mid 2011) with 4 memory slots, 2 have a 2 GB each, is it OK to put a 4 GB in each of the empty slots or should I buy 4 new 4 GB and replace all, Sebastian Cheers

You can put 2 x 4 GB DIMMS in the empty slots, this will give you a total of 12 GB. iMacs are very sensitive to the RAM, it is best to buy RAM from reliable sources like Crucial (direct purchase) or OWC OWC RAM

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