Re: Late 2013, 27-inch iMac, 2x4GB upgrade vs 1x8GB upgrade?
@subrat Thanks for contacting us today. I pulled up your system specs and it looks like your system does not run in dual channel. Installing a pair would have no advantage over the pair of modules. It would be best and cheapest to install a single 8GB memory module in your system instead of two 4GB modules. Please let us know if you have any other questions or concerns.