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|Version of macOS|
macOS Sierra (10.12) is a version of macOS that was released on 20 September 2016. It is the first version of Mac OS X to use the "macOS" branding for marketing materials, matching the rest of Apple's OS names (iOS, watchOS, tvOS, etc). It is the first version of macOS to drop support for non-SSE4.1 Intel CPUs (like the 65nm Core 2 Duo (Merom) and the 65nm Xeon (Clovertown).