Actually it depends on firmware/model. I used to have two PM1725 and one was supporting namespaces. It might be that standart worked and Oracle did not, or other way. I got another 6.4T drive, not Oracle, and it doesn't support NSLooks like the Intel 4510 support namespaces as well.
Describes support of multiple namespaces in Data Center drives.www.intel.com
my Oracle F320 (Samsung 1725a) does not support them:
the key indicator seems to be this :
# nvme id-ctrl /dev/nvme1 -H
oncs : 0x6
[5:5] : 0 Reservations Not Supported
[4:4] : 0 Save and Select Not Supported
[3:3] : 0 Write Zeroes Not Supported
[2:2] : 0x1 Data Set Management Supported
[1:1] : 0x1 Write Uncorrectable Supported
[0:0] : 0 Compare Not Supported
I will use two of those drive to split them in cache tiers, to create 4 Disk groups in vSAN.