Thanks for joining the Chipset community.
If your SSD was previously accelerated and you installed new operating system without disabling acceleration, it may be a possibility that some metadata is still stored on the SSD.
In order to enable acceleration again, you will need to format SSD as low level format and try acceleration feature again.
Depending on the SSD brand you own, there are proprietary utilities you could download from your SSD maker web site.
See the link below for more information:
The content on the above site is not controlled by Intel. This information is offered for your convenience and should not be viewed as an endorsement by Intel for the merchants or services offered there.