Chosen Solution
Mac Pro 2012 Installed SSD which is 6 Gigabit, but running at 3 Gigabit ! It says Negotiated Link Speed : 3 Gigabit
Please check attached screenshot, what am I missing? New Firmware or Driver? Update (01/02/2020) Please check attached 2 images, one showing 6 Gigabit Speed and other 3 Gigabit Speed, what’s the difference between these two devices in Mac Pro (5,1) 2010 model? One is Generic AHCI Controller (6 Gigabit) and the other is Intel ICH10 AHCI Controller (3 Gigabits) !!!
Nothing wrong here! The systems SATA port is only SATA II (3.0 Gb/s) so putting in a SATA III (6.0 Gb/s) SSD won’t alter the systems I/O data path speed higher than what it is able to support. Think of it this way… The escalator you are standing on is only going so fast, you can’t make it go faster. Be aware not all SSD’s are able to negotiate (or work) at the slower I/O speed. Review your spec sheet for the given drive. If it doesn’t state its compatible, its a fixed speed drive! Many drives today are dropping dual speed support Samsung SSD’s are one of the few that will work across all three SATA I/O speeds.
