If you have highly classified data on the drive then grinding it into sand sized particles or incinerating it should be considered. Unless you are selling to a state actor who would find it worth the expense of recovering the data using specialized equipment, then any of the overwriting methods should suffice. The problem is that overwriting with software designed for spinning hard drives may not access all of the SSD memory sites. The last time I checked DBAN would not securely erase an SSD. I am not familiar with the intel toolbox, but if this is the manufacturer's solution then it should be able to do the job, but not under Windows 10. I would use something like KillDisk free or Aoemi Partition Assistant Standard (free) that specifically states it will do the job or put the device in a Win7 computer and use the W7 version of intel toolbox. Some of these secure erase tools actually do not overwrite, but do a reset which wipes the memory sites, but the effect is the same. Of course the simple/secure method is to keep your drive/partition encrypted with a strong password, then just make sure the password is not transferred with the computer.
 
http://www.killdisk.com/erase.htm
 
https://www.disk-partition.com/download-home.html
 
 
Article ID: 000006084
 
You can securely erase an Intel® Solid State Drive (Intel® SSD) using the Intel® SSD Toolbox.
Note

• You need secondary access for target drive for Secure Erase.
• Remove all drive partitions.
• You cannot Secure Erase a current working drive.
• Securely destroy and properly dispose of replaced SSDs.
• Windows 8*/8.1* and Windows® 10 do not allow secure erase.

I once cleared a drive using the following method:

Ensure that the Recycle Bin does not store anything on the drive
Delete everything off it
Do a quick format
Create a blank database with only numeric fields and save it on the drive
Type in some random numeric data
Clone the record until it reaches a limit when the drive is full
Delete the file

This should fill at least 99% of the drive with meaningless data. However, I'm not sure whether this method is still feasible. Harddrives used to be a lot smaller when I did this.

Good stuff guys. Using the intel Toolbox I made boot usb drive to secure erase the drive. Those were the instructions. . Intel says that their toolbox is made for their SSD drives. I knew DBAN was NOT for SSDs specifically that is why I used it first, then used the intel tool.
 
Sad that I have to just store the SSD in a closet instead of putting it in a a very fine i7 3770, 32GB ram, antec 650W PSU etc, etc and sell it.
 
Oh well I guess that is life in this day and age. It's not like I had US secrets on the drive, but I did have passwords and a password program and receipts, etc
 
Just was hoping to get some re assurance, but I certainly didn't want false re-assurance so I truly appreciate everyone chiming in.
 
 

This page on using a bootable Linux image and the hdparm tool to securely erase an SSD might be useful.

https://grok.lsu.edu/article.aspx?articleid=16716