I have one NVMe SSD slot and want to replace my SSD

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If you're looking to add a PCI ExpressNVMe drive to a desktop with an older motherboard that lacks slots, one option is an drive on a carrier card

ATP offers both SATA and PCIe solutions ATP NVMe SSDs are designed for a PCIe x4 interface Size Matters  Especially in the demanding server and gaming areas, this card is perfectly suited to expand the existing system by four fast NVMe slots All slots can be

slot coiner real or fake A slot that can do SATA will have the M key andor B key A slot that cannot do SATA will not have either the M or B key, but others instead That's definitely not an NVMe slot then, as NVMe is a storage protocol, not a generic expansion interface