A little info
Some screendumps for comparing:
Top left- a 500GB Samsung EVO 970plus NVMe (my system-disk).
Top right- a WD-Green 4TB (64MBcache) all standard slow HDD.
Bottom left- a WD-Black 6TB (256MB cache).
Bottom right, the same WD-Balck 6TB (over), with Optane 32GB
And, yeah.., it makes a huge difference in practical use, and for the price it's just excellent.
If not for the upgrade by Intel in 2018 (te option of using Optane with slave-hdd's, only system-disks), it would have been money out of the window -for me, cause Optane _can not_ be paired with other NVMe's.
It can be paired with SATA-SSD's, but well.., I don't think that's "price-efficient

.
Anyway, so If you got a Optane compatible motherboard and CPU and would like a fast!, large HDD, I do recommend the Intel Optane 32GB -at no doubt
