Attention: I had installed this card "QNAP QM2-4P-384" in my QNAP VTS-873e with 4 WD Blue 3D NAND (item 6408463) which were not accepted by the system when they were installed in the card. It shows that the card is in the system but no SSDs are installed. I suspect that the interface "M.2 B&M Key" on WD Blue 3D NAND (item 6408463) is not compatible with the interface required by the card. The WD Blue 3D NAND will work when installed directly in the two QNAP VTS-873e slots but NOT when installed in the card. The disadvantage of this configuration is that the chips get too hot despite good heat sinks and the CPU fan has to be manually set to maximum to keep the temperature below 50 °C. Question: Does anyone know which SSD chips fit this card or what it depends on? and which ones are available at digitec ?