"Q4: Will Intel Optane memory also accelerate an SSD? If so how much?
A: Yes. Intel Optane memory can be used to accelerate any type of SATA-based storage media, including SATA SSDs, However, the performance benefit of adding Intel Optane memory will be greater on slower storage devices like an HDD versus a relatively faster storage device like a SATA-SSD. Additional performance data is forthcoming"
http://www.intel.com/content/www/us/en/architecture-and-tech...