Does it come with a cable ?

No. It just is the circuit card as shown. The U.2 cable is necessary. It is the full X4 standard, whereas some M.2 is only X2, and is only at the speed of SATA III. I purchased Highpoint RAID cables, which have enough length to fit in my large full sized tower. The U.2 cable uses a SATA power connector, and X4 PCI channels, which is different than SATA. Also, my cables did not have locks on the connectors going into the circuit card. And, if you want to boot to it, you might need to add NVMe drivers to you SMBios. I hope that this helps.

Would this work up to Gen4 PCIe speeds?

May we used it into Laptop SATA port?

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Main image of StarTech U2M2E125 M.2 to U.2 Adapter - for 1 x M.2 NVMe SSD - U.2 (SFF-8639) Host Interface - SSD M.2 - NVME M.2 SSD - M.2 PCIe SSD - M.2 Drive

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StarTech U2M2E125 M.2 to U.2 Adapter - for 1 x M.2 NVMe SSD - U.2 (SFF-8639) Host Interface - SSD M.2 - NVME M.2 SSD - M.2 PCIe SSD - M.2 Drive

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Add the fast performance of an M.2 NVMe SSD to your desktop computer or server through a U.2 (SFF-8639) compatible interface on your motherboard
The M.2 to U.2 adapter supports one M.2 PCIe NVMe SSD (M-Key) and provides a cost-effective way to add M.2 NVMe performance
M.2 Drive to U.2 (SFF-8639) host adapter for M.2 NVMe SSDs
Fast and easy setup with native OS support
M.2 drive adapter
M.2 NVMe SSD adapter
U.2 (SFF-8639) host interface
NVME M.2 SSD Adapter
SFF-8639 Adapter

Overview

Specs

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This PCI Express M.2 to U.2 adapter makes it easy to install an M.2 PCIe NVMe SSD into your desktop PC or server, and connect to the drive through an available U.2 (SFF-8639) compatible interface on your motherboard.
Upgrade your system cost-effectively
The M.2 to U.2 adapter is ideal for IT professionals, system integrators and installers, and enthusiasts who are building or upgrading a server or desktop computer. It supports one M.2 PCIe NVMe SSD (M-Key), providing a cost-effective way to add M.2 NVMe performance to your computer or server through an available U.2 (SFF-8639) compatible interface on your motherboard.
Easy installation
The M.2 to U.2 adapter works with all desktop PCs and servers that have an available drive bay or a U.2 (SFF-8639) compatible host interface. The adapter card is OS independent, so there are no drivers or software required for installation.
The U2M2E125 is backed by a StarTech.com 2-year warranty and free lifetime technical support.

Model
Brand	StarTech.com
Model	U2M2E125
Color	Red

Details
Specifications	Drive Connectors: 1 - M.2 (NGFF, M-Key, PCIe x4) Host Connectors: 1 - U.2 (SFF-8639, x4 PCIe, NVMe) Product Height: 0.3 in [7 mm] Product Length: 3.9 in [100 mm] Product Weight: 1.3 oz [36 g] Product Width: 2.8 in [70 mm]

Features
Features	Increase your system speed and performance cost-effectively, by adding an M.2 PCIe NVMe SSD to your PC or server Adapter supports one M.2 PCIe NVMe SSD (M-Key) U.2 (SFF-8639) host interface Fast and easy setup with native OS support Backward compatible with earlier versions of PCIe

Additional Information
First Listed on Newegg	September 10, 2025

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StarTech U2M2E125 M.2 to U.2 Adapter - for 1 x M.2 NVMe SSD - U.2 (SFF-8639) Host Interface - SSD M.2 - NVME M.2 SSD - M.2 PCIe SSD - M.2 Drive

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StarTech U2M2E125 M.2 to U.2 Adapter - for 1 x M.2 NVMe SSD - U.2 (SFF-8639) Host Interface - SSD M.2 - NVME M.2 SSD - M.2 PCIe SSD - M.2 Drive

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