Comment 63 for bug 1259829

@Jeffrey

AFAIK, the Crucial M500 uses the Marvell 88SS9187 controller, while the M550 and MX100 both use the Marvell 88SS9189 controller, and therefore probably share the same firmware (or maybe the MX100 firmware was forked off of the M550 firmware):

"These new Crucial MX100 SSD series features the Marvell 88SS9189 controller, a minor upgrade from the 88SS9187 that was found in the M500 drive."

http://www.legitreviews.com/crucial-mx100-256gb-512gb-ssd-review_143984

"The short summary is that the MX100 builds on the same architecture as the M500 and M550. The only fundamental difference is the NAND inside as the controller is the same Marvell 88SS9189 silicon as found inside the M550. The 9189 is a minor upgrade over the 9187 and what it does is provide better support for DevSLP along with some bandwidth optimizations."

http://www.anandtech.com/show/8066/crucial-mx100-256gb-512gb-review