When reading through product marketing and articles, you may be left wanting more from your home network. That is, more speed than the typical 1GbE most homes have available. An ISP's router and many aftermarket alternatives still only support 1GbE, though we're seeing more devices come rocking 2.5GbE (or higher) connections. That then leads to one considering a network upgrade. Would it be worth more than doubling LAN bandwidth?

Unfortunately, like most answers we can provide on similar topics, it all depends on what you intend to use the LAN for. If it's for infrequent file transfers and a few clients on the network, you'll likely only really notice their benefit a small amount of the time. The rest will be the network sitting and waiting for something to do. The difference between 1GbE and 2.5GbE isn't massive either, especially for file transfers.

A 1Gb LAN can handle around 100 MB/s of data fully saturated. This could be a single file transfer between your PC and network-attached storage (NAS), or a few connections between your TV, console, and laptop with the router. Every client shares the slowest part of the network. If your devices and LAN support 2.5GbE, and yet the NAS only has a 1GbE port, everything to and from the NAS will be limited to 100 MB/s for that link. Moving to 2.5GbE more than doubles this capacity up to around 290 MB/s.

There's a slight catch in that most people simply don't have any workloads that would benefit from 2.5 GbE.

Don't always buy into the hype

These aren't the upgrades you're looking for

Although router, motherboard, NAS, and other product brands would have you believe 2.5GbE is the way forward and should be favored over 1GbE when shopping around, this isn't always the case. You may upgrade from 1GbE to 2.5 GbE and notice no real tangible improvement. Then there's the possibility of encountering instability or driver issues, especially when attempting to source the cheapest hardware available.

Then there's the fact that most workloads don't benefit from increased bandwidth. Let's take your smart TV as an example. Connecting it to your router or LAN via cabling is always going to be better than using the wireless network for latency and reliability, but even then, you won't be pushing it hard enough to fully saturate the network. Streaming a 4K movie through Netflix only requires around 25 Mbps.

You could stream almost 40 4K movies with that measly 1 Gbps you so desperately wish to upgrade. In fact, many super-fast fibre connections cap at around 1 Gbps, with only a few more expensive plans offering speeds surpassing that, requiring new and more powerful hardware. 1 Gbps continues to be the default on most hardware in 2025, though we are seeing a slight shift to 2.5 Gbps.

2.5 GbE is an improvement over 1 GbE without a doubt, but it's more of a cost-sensitive option for manufacturers who don't wish to load up consumer-grade hardware with overkill 10 Gbps networking. The reality is your LAN isn't often the bottleneck. Depending on what you use the LAN for, you could be experiencing slowdowns due to NAS drives, external storage, wireless issues, ISP troubles, and even old or underpowered hardware.

Hidden costs and reliability issues

It's not quite as clear-cut

Consider what you use the network for. Even smart home services such as Home Assistant won't require much bandwidth. Plex and Jellyfin streaming can put some strain on things with high-bitrate direct play, but even then, there's still availability left on the table. Most clients won't do high-traffic tasks simultaneously. Then there are automated backups, scheduled for late hours, right?

Even a few virtual machines (VMs) and Docker containers with plenty of smart home traffic will struggle to fully saturate the 1 Gbps LAN. You'll only really experience quite the uplift moving up to 2.5 GbE if you have multi-gigabit internet, frequently transfer large files between a NAS and clients, run virtualization clusters, have a dedicated home lab environment, and utilize high-performance NFS or iSCSI storage.

You'll often find cheap 2.5 GbE ports using Realtek RTL8125 chipsets, which aren't great for a number of reasons. There were known issues with drivers, dropping packets under load, the entire network interface card (NIC) resets with CPU entering low-power states, and instability with other behaviors and inconsistencies. It's not a great time, and one not reflective of what Realtek can produce. Even Intel's own i225-V and i226-V NIC chipsets had early revisions to address problems.

The worst thing to happen to your 2.5 GbE upgrade is devices not communicating with one another properly (particularly between brands), leading to failed negotiations. Finally, your 2.5 GbE-capable hardware could drop to 1 GbE during periods of heavy network traffic.

The messy issue of Cat cabling

Ethernet cabling is a mess if you're unfamiliar with standards. We've got Cat5e, Cat6, Cat6a, Cat7, and Cat8. The higher the number does not equate to higher cable quality. It does usually increase cost, however, so a Cat8 cable will be significantly more expensive than Cat5e. That said, a good quality short Cat5e cable should be able to provide enough bandwidth for 2.5 GbE networking. It's usually when you move into longer distances that you will require Cat6.

Cat6 cabling can be found at reasonable prices and should be picked over Cat5e if there's really not much between them. This cabling will easily handle 1 Gbps, 2.5 Gbps, and even 5 Gbps over longer distances throughout the home. It may struggle with 10 Gbps over longer distances. It's what we'd typically recommend you get installed in the walls of your home to avoid needing to upgrade sooner than later. Regardless of what cabling you end up using, it's likely to be notably better than Wi-Fi.

2.5 GbE is not always faster

It may be on paper, but real-world usage is different

It's no secret that a 2.5 GbE network will perform better than a 1 GbE LAN, thanks to the additional headroom for tests to really stretch their legs with all the right hardware and cabling in place. But this doesn't tell the whole story, which can wildly fluctuate. Firstly, you only get to enjoy 2.5 GbE if both ends support it. Should your switch only have an array of 1 Gbps ports, that 2.5 Gbps Ethernet port on your PC just got relegated.

Even then, should your device have a speedier Ethernet port, it may be limited to slower speeds internally, thanks to a lack of available system resources to adequately power the NIC for 2.5 Gbps and beyond. Some invisible (at least to us mere humans) overheads should be factored in, such as encryption, negotiations, resource limits, and cabling that can hinder actual data transfer speeds — don't be shocked to see a 10% drop from that 2.5 Gbps figure.

If you're using a NAS with mechanical drives, you won't be hitting full speed anyway, depending on the RAID configuration. SATA SSDs are at least fast enough to surpass the speeds supported through 2.5 Gbps links, but you'll need to be writing to or reading from another SSD. NVMe is superfast but expensive and not often used for storing data inside a NAS. But if your home lab transfers a lot of data between systems, 2.5 Gbps networking could make sense.

Only upgrade if you need to

The truth of the matter is, 2.5 GbE networking can be a sizable upgrade to the home LAN, but that's only if you have the right hardware, ports, cabling, and tasks to fully utilize this increased speed. If you won't do much more internally to fully saturate the 1 Gbps capacity, you're wasting money on upgrading. Most internet plans hit a 1 Gbps ceiling, so you won't be able to enjoy faster external connections either.

What would make for a better upgrade would be an adequately designed mixed-speed network using a combination of 1 Gbps and 2.5 Gbps or going right ahead to 10 GbE rather than making some drastic changes to accommodate 2.5 GbE. If you have multi-gig internet, move larger files often, and use SSD-powered NAS, 2.5 GbE can make more sense. If your LAN usage is more casual, I'd hold out until moving further up the speed ladder.