When building or upgrading a PC, it's easy to overlook the M.2 slot. Most people glance at it, assume it's just for storage, and move on. But that little connector is a lot more interesting than it seems. Nestled between the larger, more visible components of the motherboard , the M.2 slot is one of those hidden pieces of PC design that quietly packs a surprising amount of versatility.
Upgraded Wi-Fi and Bluetooth
High-speed lanes aren't just for cars.
One of the smartest ways to take advantage of an M.2 slot is to upgrade your PC's wireless performance. Many laptops and desktops have M.2 Key E or A/E slots dedicated to networking modules, and the good news is that these cards almost always combine Wi-Fi and Bluetooth on the same board. You can swap to a modern option (e.g., Intel AX200, AX210, or a Qualcomm-based module) to get Wi-Fi 6 /6E support and newer Bluetooth versions. These 22x30mm (2230) modules connect via PCIe (or, on some Intel platforms, CNVi/CNVio2) for easy installation.
The benefits go far beyond the headline speed numbers, although achieving 2Gbps speeds is impressive in itself.
Add a 4G or 5G LTE modem
Because your computer deserves a SIM card too
Another way to get creative with an unused M.2 slot is to add a cellular modem, giving your computer built-in mobile broadband. These cards, often in the M.2 Key B or BM format, integrate a 4G LTE or 5G radio, SIM interface, and antenna connector into a compact module. Once installed and paired with the right antenna, your computer can connect directly to a cellular network without the need for a hotspot or USB device. Popular options include the Sierra Wireless EM7455 (often sold under various brand names, such as Mugast) and the popular M.2 (NGFF) Key B to Mini PCI-E adapter boards, which add a SIM slot.
Experiment with M.2 graphics options
Yes, you can put a GPU in there.
You're probably wondering if you can actually use a GPU on an M.2. Well, sort of, yes, but don't expect miracles.
There are GPUs designed specifically for the M.2 form factor, though they're more aimed at embedded and industrial systems than gaming rigs. ASRock's M2_VGA, for example, is just a simple display controller with a VGA port. It proves the idea is viable, but it's still not powerful enough to handle modern games.
If you're willing to tinker, you can use an M.2 to PCIe riser adapter from companies like ADT Link to connect a desktop GPU via the M.2 x4 slot.
Ethernet Card
Sometimes cable still wins
You can use the M.2 slot to upgrade your system's Ethernet by installing an external Network Interface Card (NIC). These compact modules typically operate on a PCIe x1 link and fit into M.2 slots keyed in A, E, or B+M/M styles, depending on your motherboard's wiring configuration. Despite taking up less space and consuming less power, they can still fully connect to RJ-45 or fiber/SFP ports. For example, Delock sells an M.2 B+M adapter built around the Intel i225V chipset, which provides 2.5 GbE speeds over standard twisted-pair cabling. Another option is the MEC-LAN-2631i module, which uses the Intel I226 controller to provide 2.5 GbE over a single PCIe x1 lane.
Turn one M.2 slot into multiple SATA drives
Divide and Conquer, Archived Version
An M.2 to SATA RAID adapter can be used to split a PCIe M.2 interface into one or more SATA ports, providing basic RAID logic such as RAID 0, RAID 1, or JBOD. For example, StarTech offers an "M.2 SATA RAID Controller Card" that supports two SATA M.2 slots, along with two SATA ports, and integrates hardware RAID functionality.
However, these adapters have important limitations. Their performance depends heavily on the controller chipset and driver support, and they almost always incur additional bandwidth and latency, so you shouldn't expect the same performance or reliability as a native SATA port or a full RAID card. Compatibility also depends on the host system. The M.2 slot must be able to provide the required PCIe signal and bandwidth, and the adapter itself must be the correct physical size and key.