Mac OS X 10.10.4, which is released on June 30, 2015 and the upcoming 10.11 “El Capitan”‎ will allow the user to enable TRIM on third party SSDs. They include a command trimforce to make this happen. If you don’t want to upgrade and still want to stick with 10.10.3. There is still a way to do it. I found a guide that showed me how to enable TRIM to on 10.10.3 to support TRIM without disabling kext signing or patching the system file IOAHCIFamily.kext by just adding one Apple signed system file AppleDataSetManagement.kext from El Capitan.

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