I broadly advise against used samsung enterprise drives. Plenty of life left in the flash, but I’ve personally had issues with their firmware being dogshit and seen enough of other people having issues that I’m forever turned off from them. Supposedly the PM9A3 drives at least have FW updates openly available, but this may or may not actually work depending on the age of drive, and they still like to enter an “ERRORMOD” state regardless, just like two of my older models did, so it’s not like that’s a real fix anyways. It’s sometimes possible to recover a drive into a usable state again, but this will result in complete data loss, so be warned. If it’s not recoverable, the only “support” you’ll get is from the “vendor” that sold it to you, not samsung.
I personally use a bunch of direct-to-CPU Intel D7-P5510 7.68TB drives, and haven’t had any issues for the ~8 months I’ve had them. They are more or less just a somewhat updated DC P4510.
That said, there is a case with the DC P4500/DC P4510 drives having performance issues when connected to a broadcom controller: Intel P4500/P4510 4 TB NVMe U.2 SSD - Abyssmal sequential results with Broadcom HBA 9400 and low read with AMD NVMe RAID0 - But Optane works fine?!, so if that’s your plan be warned.
Note that Intel sold it’s datacenter drive business to Solidgm/SK Hynix, so the tool to update those is now at: Solidigm™ Storage Tool
Note that connecting U.2 nvme drives can sometimes cause hair loss, as finding a method to connect them without errors is not guaranteed. Generally a PCIe adapter card seems to work best if you just have 1-2.