The Dell OptiPlex 7040 Micro supports SATA or NVMe in its single M.2 slot

The OptiPlex 7040 Micro keeps its storage flexible: the M.2 2280 slot handles either SATA or PCIe NVMe SSDs. It also includes one 2.5-inch SATA hard drive or SSD bay. It’s a capable little system for a compact office PC, giving you options without overcomplicating things.