Installed an Accelsior 240Gb SSD in my MacPro. At first all seemed well. Then I had problems with my system locking up in sleep mode even though I had installed the OWC driver to eliminate this problem. Had to unplug my external drives, which were purchased from OWC to stop the sleep issue. Then my system began refusing to shut down. A total waste of my time and money. Prior to installing the Accelsior I had zero problems with my MacPro.