"But, only he knows what he is wanting it for."
You are right, we don't know to what extent he got serious
Two Intel Optane 900P's could be candidates for database temporary tables/logs or ZFS's SLOG, when mirrored.
RAID results with two 480GB drives. I'll have a an additional article with 4x drives behind a Highpoint RAID controller soon. That article will also feature RAID 5 off the chipset.
"VROC's performance is disappointing. At the very least we expected to see parity between a single Optane 900P SSD and the VROC array, but the single drive delivers much more performance in desktop applications than the array."