We understand you have some questions about the over-provision space of your SSD.
For a clear information on how to use this feature, you can access this http://www.intel.com/content/dam/www/public/us/en/documents/white-papers/ssd-server-storage-applicat... PDF, and go to the page 15, there you will find all the details you need on how to use it and set it up.
Please let us know if you need more assistance.
We are following up, and we'd like to know if you require further assistance or if you have any other questions?
We'll be waiting for your response.