I recently upgraded the memory in my 27" iMac, mid 2011. took out the two, 2 gig in the top slots & put in two 8 gig units. For some reason I wasn't thinking about putting the 2 gig units in the bottom slots. Is this ok? Will it help any?



It will likely work, however many people will advice you to only use matching sticks of RAM. In other words, if you're going to use 4 sticks, ensure they are all of the speed, capacity, brand, etc.

You wouldn't build a RAID array with mismatched drive manufacturers, speeds, and capacities, why do it with your RAM?

  • Actually, neither capacity nor brand are important, if speed, ECC etc all match & each pair are truly identical. My machine runs perfectly happily on a pair of 1s, a pair of 4s, & a pair of 8s, giving the odd total of 26GB RAM. – Tetsujin Oct 24 '14 at 6:59
  • Thanks guys. I think I will install them & see how it goes. – David Oct 24 '14 at 10:10

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .