Question about Intel Optane Cache

[coolz202]

I saw a video LinusTechTips did a while ago using an Intel Optane Cache drive to boost his secondary 12TB hard drive to have SSD like performance, and it looks really cool and all. But when I found out that it's only meant to boost your boot drive, I got very confused. Linus mentioned in his video that Intel had added support for secondary drives, but other sources I'm reading is telling me otherwise. Could anyone help me out?

 

[USAFRet]

Early iteration of Optane would only work with the boot drive.
Later, it now can work with other drives.

It is simply a high speed cache for an HDD. It does NOT speed up the whole drive...only that data which resides in the 16GB or 32GB cache space.