Yes, as i said in that post, and here Intel RST/RSTe Drivers (latest: v19.5.5.1052/ v8.0.4.1006) - #2394 by rajkosto
anything AFTER 15.2, starting with 15.5 (and ive tried a couple of versions from each of v16, v17, v18, etc), which has Optane support, has this high cpu usage (and low throughput because of CPU limitations on many-disk RAID5) bug. and it still hasnt been fixed in in the latest v18 we got in 2023.
And this is on a Gigabyte Aorus Pro Z390 board with latest bios, so the firmware RST is way newer than v15 anyway, that has no effect on this bug, v15.2.16 is still the last version that has normal CPU usage and performance on RAID1/RAID5 arrays.
It’s also not something with my configuration/OS, because i’ve had it on win8.1, win10, and i just tried it with a clean install of win11 with latest driver 18.37.7 and it still has the high cpu usage.
Here is a mirror of the v15.2.16 you had previously in the main post, the last version for me that has normal CPU usage and performance on RAID1 and RAID5 arrays.
full set: 12.5 MB file on MEGA
64bit driver only: 403.3 KB file on MEGA