![]() You can get both the 21-inch Retina 4K iMac and 27-inch Retina 5K iMac with old fashioned hard drives if you really want to: 1 TB 5400-rpm for the Retina 4K, and 1 TB 7200-rpm for the Retina 5K. It retains four user-accessible SO-DIMM slots, so you can upgrade later if you want to.īoth iMacs ship with faster 1867MHz DDR3 memory as well. The 27-inch Retina 5K iMac starts at 8GB and is configurable up to 32GB. Unfortunately, you can't change that post-purchase, so make sure you configure your maximum RAM during purchase. The 21.5-inch Retina 4K iMac starts at 8GB and is configurable up to 16GB. Apple is, however, using the latest versions of the Broadwell chips released just past summer. Intel hasn't released the Skylake version of the chips used in the 21.5-inch Retina 4K iMac yet. Indeed! It's the same 14-nanometer process as Broadwell, but with a redesigned microarchitecture that brings better performance at greater efficiency. ![]() Wait, rewind: The Retina 5K iMac is leapfrogging Broadwell and going straight to Skylake?
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