Don’t ignore your desktop PC’s empty M.2 slots – they’re more useful than you think


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ZDNET’s key takeaways

  • Most desktop users have at least one M.2 slot in their PC. 
  • These slots aren’t just for storage. 
  • Options include upgraded internet bandwidth and additional USB ports.

I’m not sure who needs to hear this, but if you have a desktop PC in 2026, you’re probably not using its M.2 slots to their fullest potential. If it’s from the last five to ten years, chances are you have unused M.2 slots that could be put to use with additional accessories. 

M.2 slots aren’t just for NVMe SSDs; they can enable devices for several different purposes, including a faster Ethernet or Wi-Fi connection, a USB port expansion, or an extra GPU. With a little investment, one or more of these devices can significantly improve the value of your PC.

Also: The best M.2 SSDs of 2026: Expert tested and reviewed

M.2 slots connect directly to your motherboard’s PCIe lanes, which are several orders of magnitude faster than older interfaces like SATA. They’re also connected to the chipset, so you don’t have to worry about stealing juice from your primary SSD or your graphics card.

To find out how many M.2 slots your motherboard has, identify its make and model. If you’re not sure, I recommend CPU-Z – a safe and reliable app that can help you quickly locate this information. Once you have CPU-Z downloaded, navigate to the Mainboard tab to display the manufacturer and model of your machine.

CPU-Z screenshot

Kyle Kucharski/ZDNET

I then recommend searching the web for your motherboard’s name to find either its manufacturer’s website or a retail site, which will often list its specs. Obviously, you can also physically check your PC — open it up and locate the physical slots on the motherboard, which are often labeled “M.2,” “M2_1,” or “M2_2”.

Upgrade your Ethernet card

If you have a desktop, you probably don’t need the portability that Wi-Fi offers. I recommend using a wired Ethernet cable to connect directly to your modem for the fastest connection possible. 

Also: I used an M.2 PCIe enclosure for data storage, and it made file transfers so much faster

Your motherboard’s stock Ethernet port likely supports either 1Gbps (1000 Mbps) or 2.5GbE, but with an advanced M.2 Ethernet card, you can open that up to 5GbE or 10GbE, significantly speeding up bandwidth for large file transfers, downloads, streaming, and sharing content between devices on your home network. 

To see how much bandwidth you’re working with in Windows 11, open Settings, then navigate to Network & Internet, Advanced Network Settings, and expand the “Ethernet” dropdown menu at the top. Look for the Link Speed metric. 

Add more USB ports

USB Colors

Kyle Kucharski/ZDNET

If you have an older PC, chances are you have only one or two USB-C ports on your desktop — and you might be at capacity for USB-A ports. You don’t need a whole new machine to get the ports you need for your accessories; just pop a USB expansion card into your unused M.2 slot, using the PCIe (Peripheral Component Interconnect Express) connection.

There are quite a few variationsof these devices available online, and depending on your motherboard and case, you’ll want to make sure the one you choose actually fits, so refer to your motherboard’s make and model for compatibility.

Also: I tested Samsung’s fastest portable SSD for work and travel, and it’s changed how I transfer data

Also, note that as with any expansion device, with a new expansion card, you’ll need to download and update the necessary drivers before it will work properly. Follow the device’s installation instructions. 

Add a secondary GPU

If you’re using your desktop for AI-powered tasks, a second GPU lets you dedicate it to those workflows, including developing AI models, rendering, and machine learning. 

But there are other reasons as well, namely, driving additional monitors. If you are creating a workstation with four, six, or eight monitors, you can achieve that with a secondary GPU designed specifically to power the monitors while your main GPU focuses on performance. 

Lastly, if you’re streaming, the same principle applies: let your main GPU handle the game while the secondary GPU powers your video feed to prevent FPS drops. 

Of course, the most common device for your M.2 slots is an NVMe SSD for additional storage. Increasing the amount of storage on your machine for media, backups, photos, and videos from your smartphones, and extra apps can prolong your device’s longevity without the need to pay for cloud storage. 





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In the ever-shifting geopolitical sphere, China’s growing military presence and the ongoing tensions over Taiwan and the South China Sea continue to be a closely watched topic — particularly in regard to China’s ambition for naval power. In recent years, much speculation has been made over the country’s rapid military development, including the capabilities of the newest Chinese amphibious assault ships.

While there’s no denying its military advancements and buildup, much has been made about the logistical and military difficulties that China’s People’s Liberation Army (PLA) would face if it launched an amphibious invasion of Taiwan. However, there’s growing concern that if a Taiwan invasion were to happen, it wouldn’t just be military vessels taking part in the action, but a fleet of commercial vessels, too — including a massive new car ferries that could quickly be repurposed into valuable military transports.

While the possibility of the PLA using commercial vessels for military operations has always been on the table for a potential Taiwan invasion, the scale with which China has been expanding its commercial shipbuilding industry has become a big factor in the PLA’s projection of logistical and military power across the Taiwan Strait. It’s also raised ethical concerns over the idea of putting merchant-marked ships into combat use.

From car ferry to military transport

The rapid growth of modern Chinese industrial capacity is well known, with Chinese electric vehicle factories now able to build a new car every 60 seconds. Likewise, China has developed a massive shipbuilding industry over the last 25 years, with the country now making up more than half of the world’s shipbuilding output. It’s from those two sectors where China’s latest vehicle-carrying super vessels are emerging. 

With a capacity to carry over 10,000 new vehicles for transport from factories in Asia to destinations around the world, these ships, known as roll-on/roll-off (Ro-Ro) ferries, are now the biggest of their type in the world. The concept of the PLA putting civilian ferries into military use is not a new one, or even an idea China is trying to hide. Back in 2021, China held a public military exercise where a civilian ferry was used to transport both troops and a whole arsenal of military vehicles, including main battle tanks.

The relatively limited conventional naval lift capacity of the PLA is something that’s been pointed out while game-planning a Chinese amphibious move on Taiwan, and it’s widely expected that the PLA would lean on repurposed civilian vessels to boost its ability to move soldiers and vehicles across the Taiwan Strait. With these newer, high-capacity Ro-Ro ferries added to the fleet, the PLA’s amphibious capacity and reach could grow significantly.

A makeshift amphibious assault ship

However, even with the added capacity of these massive ferries, military analysts have pointed out that Ro-Ro ships would not be able to deploy vehicles and soliders directly onto a beach the way a purpose-built military amphibious assault ship can. Traditionally, to deploy vehicles from these ships, the PLA would first need to capture and then repurpose Taiwan’s existing commercial port facilities into unloading bases for military vehicles and equipment.

However, maybe most alarming is that satellite imagery and U.S. Intelligence reports show that, along with increasing ferry production output, the PLA is also working on a system of barges and floating dock structures to help turn these civilian ferries into more efficient military transports. With this supporting equipment in place, ferries may not need to use existing port infrastructure to bring their equipment on shore.

Beyond the general military concern over China’s growing amphibious capability, there are also ethical concerns if China is planning to rapidly put a fleet of civilian merchant vessels into military service. If the PLA were to deploy these dual-purpose vessels into direct military operations, the United States and its allies would likely be forced to treat civilian-presenting ships as enemy combatants. On top of all the other strategic challenges a Taiwan invasion would bring, the U.S. having to navigate the blurred legal lines between military and merchant vessels could potentially give China a strategic advantage amidst the fog of war.





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