02-10-2021, 03:31 PM
Here is a decoded version of a model number:QM2-2P-344Q - QnapM2 - m.2-2 - m.2 slotsP - nvme-3 - gen 34 -x 4 lanes4 - 4 internal x lanesThe speed difference between these two cards is as follows:QM2-2P-244A -> 2GB/sQM2-2P-344 -> 4GB/sThe speed of TS-251D PCIe is around 2000MB/sSo I would recommend QM2-2P-244A unless you would move this card to a future NAS. Then Gen3 would be useful.I hope this helps.