Apple quietly slipped support for a feature called NVMExpress into the latest version of OS X, which shipped early last week. This addition to the software enables some newer Macs using PCIe-based solid-state drives to achieve greater data transfer speeds.

Not every Mac that uses an SSD for storage will be able to take advantage of this new protocol, however. The screenshot above comes from a late 2013 MacBook Pro with a solid-state drive that doesn’t support the feature. The newest 13-inch MacBook Pros are also left out. In fact, at the moment it appears that only the 12-inch MacBook sports a support drive.

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