If there is room in the PCIe slot, it is likely to perform better with a card that supports PCIe x4. The Inspiron 660s has one PCIe x16 and one PCIe x1 slot, but since I have a graphics card in the PCIe x16 slot, I chose the one that supports PCIe x1. NVMe PCIe x4 x2 M.2 NGFF SSD to PCIe x1 Converter Adapter PCIe x1 to M.2 Full/Half Size However, I found an adapter card that converts M.2 NVMe to PCIe. To begin with, Inspiron 660s does not have an M.2 slot, so it is not possible to use M.2 NVMe SSD as it is. I want to move the contents of the original HDD to SSD and boot Windows 10 from SSD.Add an M.2 NVMe SSD to the above system.I started thinking that I could use it to upgrade an old PC (Dell Inspiron 660s) to an SSD. The SSD (Western Digital SN730 NVMe 256 GB) which was removed in this article ('Replaced the SSD in my gaming PC') was put in the USB connection NVMe M.2 SSD case, but there is no place where it is not useful. Using an M.2 NVMe SSD on an older PC that does not support NVMe はじめに