Owen Bradley Walk into any shop or open any listing page and ethernet cable turns into an alphabet soup: Cat5e, Cat6, Cat6a, Cat7, Cat8, each promising more speed than the last and each costing more per metre. The uncomfortable truth is that most home networks are perfectly served by the second-cheapest option, and a great deal of money is spent on cable that cannot possibly deliver a benefit. This guide explains what actually separates Cat6 vs Cat6a ethernet cable and the rest of the range, what the numbers on the jacket mean, when shielding is worth paying for, and how to buy the right cable once rather than overbuying for a network that will never use it.
What the Category Number Actually Measures
Every category defines two things: the bandwidth the cable is certified to carry, measured in megahertz, and the resulting data rate it can support over a given distance. Higher categories achieve more bandwidth through tighter twist rates in the pairs, better insulation, sometimes a plastic spline separating the pairs, and in the higher grades a layer of shielding.
The point of all that construction is controlling crosstalk, the tendency of a signal in one pair to bleed into its neighbours, and rejecting external interference. As frequency rises, both problems get worse, which is why a Cat8 cable is physically thicker and stiffer than a Cat5e cable that looks superficially identical. Crucially, category is a rating of the whole channel. A premium cable terminated into an old wall socket, or joined by a cheap coupler, performs at the level of its weakest component rather than the number printed on the jacket.
Cat5e: Still Good Enough for Most Homes
Cat5e supports gigabit speeds over the full 100-metre run and carries 100MHz of bandwidth. That is the honest baseline, and for the vast majority of households it is entirely sufficient, because the internet connection and most consumer network ports top out at gigabit anyway.
It is also the thinnest and most flexible of the family, which matters more than people expect. Cat5e bends easily around skirting boards, fits through tight conduit and terminates without a fight. If you are cabling a house today, though, the price gap to Cat6 has narrowed to the point where there is little reason to choose Cat5e for permanent installation. Where it still shines is short patch leads: a half-metre lead from a switch to a router does not need Cat6a stiffness, and a slim Cat5e patch keeps a rack tidy.
Cat6: The Sensible Default
Cat6 raises bandwidth to 250MHz and adds tighter construction, often including a spline that keeps the four pairs separated along the length of the cable. It carries gigabit comfortably to 100 metres and supports 10 gigabit speeds over shorter runs, generally quoted at up to 55 metres in good conditions and less in a bundle where cables interfere with each other.
For a typical home this is the right choice for anything permanent. It costs only slightly more than Cat5e, remains easy enough to route and terminate, and gives genuine headroom if you later upgrade to multi-gigabit equipment. Most rooms in a house are well under 55 metres of cable run from the network cupboard, so the 10 gigabit limitation rarely bites in practice. Pair it with hardware that can use the capacity; our roundup of the best gigabit routers covers what to look for if your current router only offers slower ports.
Solid Core Versus Stranded
This distinction matters more than the category number for reliability. Solid-core cable uses a single conductor per wire and is designed for fixed installation inside walls and trunking, punched down into wall sockets and patch panels. Stranded cable uses many fine strands, flexes repeatedly without fracturing, and is what patch leads are made from. Using solid core as a patch lead that gets moved daily leads to broken conductors and intermittent faults that are miserable to diagnose. Use each for its intended job.
Cat6a: When the Extra Cost Is Justified
Cat6a doubles bandwidth again to 500MHz and, more importantly, guarantees 10 gigabit speeds across the full 100-metre run. It achieves this partly through improved geometry and partly through shielding on most variants, which suppresses alien crosstalk between adjacent cables in a bundle.
The trade-offs are real. Cat6a is noticeably thicker and stiffer, has a larger bend radius, fills conduit faster and takes longer to terminate correctly. Shielded versions require shielded connectors and proper earthing at one end, and a shield that is not earthed correctly can behave worse than no shield at all.
Buy Cat6a when you are cabling long runs above 55 metres and expect multi-gigabit use, when you are running many cables in a tight bundle, when the route passes close to mains wiring or industrial equipment, or when you are wiring a home permanently and want to avoid ever revisiting the decision. For a home office feeding shared storage, the extra headroom is often worth it, and combining it with hardware built for sustained transfers matters just as much; the best routers for NAS comparison covers the throughput side of that equation.
Cat7 and Cat7a: The Odd Ones Out
Cat7 offers higher bandwidth on paper but was never ratified by the same standards body that defines the rest of the range for use with standard RJ45 connectors. In its original form it uses a different connector entirely, which no consumer equipment accepts. Cables sold as Cat7 with RJ45 plugs are effectively well-built shielded cable operating outside the certification that would make the label meaningful.
The practical advice is straightforward: skip it. If you want more than Cat6a, the properly ratified next step is Cat8. If Cat6a covers your needs, buy Cat6a from a reputable manufacturer rather than an unratified Cat7 that costs more and delivers nothing extra with the connectors you actually use.
Cat8: Fast, Short, and Almost Never Needed at Home
Cat8 pushes bandwidth to 2000MHz and supports 25 and 40 gigabit speeds, but only over a maximum run of 30 metres. It is heavily shielded, thick, expensive and awkward to route. It was designed for short switch-to-switch and switch-to-server links inside data centre racks, which is exactly the environment where those constraints do not matter.
In a home, Cat8 is almost always wasted money. Consumer equipment with 25 or 40 gigabit ports is rare and expensive, the distance limit rules out most whole-house runs, and the stiffness makes installation harder. If someone sells you Cat8 patch leads for connecting a games console to a router, they are selling you a cable that cannot do anything the console’s gigabit port could not already do with Cat5e.
Shielding Explained: UTP, FTP and S/FTP
You will see letter codes alongside the category. UTP means unshielded twisted pair, which relies purely on the twist geometry to reject interference and is the standard in ordinary homes. FTP adds an overall foil screen around all four pairs. S/FTP shields each pair individually and adds an overall braid, which is the most robust and the most expensive.
Shielding helps in genuinely noisy environments: cables running alongside mains for long distances, workshops with motors and welders, or dense bundles carrying 10 gigabit traffic. In a normal house it is usually unnecessary, and it introduces a new failure mode, because a shield must be bonded to earth at one end only. Bonding at both ends creates an earth loop that can inject noise rather than remove it. Unless you have a specific reason, unshielded cable correctly separated from mains runs is the simpler and often better choice.
Terminations, Sockets and the Weakest Link
A network is only as good as its worst component, and that is rarely the cable. Wall sockets, patch panels, couplers and connectors all carry category ratings too, and mixing a Cat6a cable with Cat5e keystones drops the whole channel to the lower rating. If you are installing to a standard, buy every component at that standard.
Termination quality matters just as much. Untwisting more than around a centimetre of pair at the connector destroys the geometry the cable relies on, and it is the single most common cause of links that negotiate at a lower speed than expected. Avoid inline couplers where you can; a single continuous run always outperforms two runs joined in the middle. Test finished runs with a cable tester rather than assuming a link light means the cable is good, since a marginal termination will pass traffic slowly rather than fail outright.
Power Over Ethernet Considerations
If a run will carry power to a camera, access point or phone, cable choice changes slightly. Higher power delivery generates heat inside the bundle, and thinner conductors get hotter. Look at the conductor gauge rather than the category alone, favour 23 AWG over 26 AWG for long powered runs, and avoid tightly packed bundles of many powered cables. Solid copper is essential here; copper-clad aluminium sold as a bargain has higher resistance, wastes power as heat and fails to deliver full power at distance. Hardware matters at the other end too, and our list of the best PoE routers explains power budgets and how to avoid overloading a device.
Buying Guidance by Scenario
- Short patch leads from switch to device: Cat5e or Cat6, stranded, in the shortest length that reaches.
- Wiring a house you plan to keep: Cat6 solid core as a default, Cat6a for long runs or if you want maximum longevity.
- Long runs over 55 metres with multi-gigabit ambitions: Cat6a, which is the only choice that guarantees 10 gigabit to 100 metres.
- Runs near heavy electrical machinery: shielded Cat6a, earthed correctly at one end.
- Connecting a home rack over a couple of metres: Cat6a is plenty; Cat8 is overkill unless the ports genuinely exceed 10 gigabit.
- Feeding cameras or access points with power: solid copper, 23 AWG, category matched to the data rate you need.
Whatever you buy, check that the jacket says pure copper and that the print includes a recognisable manufacturer and category marking. Copper-clad aluminium is the most common quality trap in cheap bulk cable. It is also worth planning the port count at the same time, since a run is only useful if there is something to plug it into, and our guide to the best switches covers sizing that properly.
Common Mistakes That Waste Money
- Buying Cat8 for a gigabit network. The cable cannot make a gigabit port faster than gigabit.
- Mixing categories in one channel. The lowest-rated component sets the performance of the whole link.
- Using solid core for patch leads. Repeated flexing fractures the conductors and creates intermittent faults.
- Choosing copper-clad aluminium. It is cheaper, weaker, hotter under power and fails at distance.
- Untwisting too much at the connector. Poor termination undoes everything the cable’s construction achieved.
Frequently Asked Questions
Will a higher category cable make my internet faster?
No, unless your existing cable is faulty or your connection genuinely exceeds what that cable supports. If your service is gigabit or slower, Cat5e already carries it fully and nothing you buy will increase the speed your provider delivers.
Is Cat6a worth it over Cat6 at home?
It is worth it for long runs, dense bundles, or if you want to wire once and never revisit it. For typical runs well under 55 metres with gigabit or early multi-gigabit equipment, Cat6 delivers the same real-world result for less money and much easier installation. The right choice also depends on your router’s ports, so check the best ethernet routers before deciding how much headroom you actually need.
Can I mix Cat5e and Cat6 in the same network?
Yes. Different runs can be different categories without any problem, since each link negotiates independently. Just avoid mixing categories within a single run, where the weakest component caps the whole channel.
Does cable colour mean anything?
Not technically. Colour is purely for organisation. Only the printed markings on the jacket describe the actual specification.
Final Thoughts
Ethernet cable is one of the few areas where buying more than you need delivers precisely nothing. Decide the speed you realistically want at each end, measure the run, then pick the lowest category that clears both comfortably: Cat5e for short patches, Cat6 as the sensible default for a home, Cat6a where distance, density or genuine multi-gigabit plans demand it, and Cat8 essentially never outside a rack. Spend the savings on solid copper, decent connectors and careful termination, because those choices affect real performance far more than the number on the jacket ever will. Wire it that way in 2026 and the cable will outlast several generations of the equipment plugged into it.
