When you have the iMac face down with the stand toward you, number the DIMM slots 1,2,3,4 with 1 nearest the base of the machine (amazingly, I have failed to find an illustration of which physical slots correspond to. I will for sure check out the Activity Monitor - thanks for the link - I had a quick look when I was using Clean My Mac yesterday and it seemed green and OK at that time but would be good to see percentage of time it is near its 8GB capacity limit. I have upgraded the memory in my new 27' late 2013 iMac and it has been an interesting experience. others said all DIMMS should be equal value e.g. Good to know re pairs but do you know why? I have seen on this forum someone adding just 1 x 8GB to a machine running 2 x 4GB and people thinking it was OK. Also, look at the memory line to see how much RAM your computer already has. I am genuinely curious as to whether the iMac intel from late 2013 would use lower voltage to run the RAM if I removed the 2 x 4GB DDR3s and installed 2 x 8GB DDR3Ls dual voltage DIMMs or would the computer still run them on 1.5v? In which case I might as well stick with the DDR3s. For example, mine is: iMac (27-inch, late 2013). I am a MSc student (nutrition not computers obvs) and can’t upgrade to a new computer so need this one to last another 2 years so I can finish my dissertation and the. are there many apple product users who do not want the “best”?! □.
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