Thanks for the info. It is coming with 16GB but I thought I would double that. Sounds like I may want to just order 32GB from OWC. I added RAM to my 2011 with no problem, so hope this will be the same.
Assuming Apple shipped 2x8GB for your 16GB from the factory and you want a total of 32GB, you can still be good.
From what other people’s experiments have shown, Dual channel needs the ram to be the same size in 1/3 and 2/4. To get full speed, you need Apple in 1/2 and 3rd party in 3/4 (or vice versa).
But if you order 2x8gb of 3rd party RAM, you can move the Apple to 1/2 and put yours in 3/4. Then you’ll have
1: Apple 8gb
2: Apple 8gb
3: Your 8gb
4: Your 8gb
With 8gb in each of 1/3 and 8gb in each of 2/4, dual channel should work fine, and they should all run at 2666 as expected. It would have been a bit cheaper and left you easy expansion if you’d just ordered 32gb as 2x16gb aftermarket, but you should be able to not waste the upgrade you paid for at least!
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