This message was posted on behalf of Intel Corporation
Currently Intel® Optane™ Memory may only be used to accelerate one Windows® 10 SATA boot drive.
Please keep in mind that an M.2 SSD can be SATA or NVMe. If your SSD is SATA, then Intel® Optane™ Memory can still be used to accelerate your system. Currently there is no information available on when or whether secondary drive caching will be enabled.