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21 facts in comparison
Cat7 Ethernet Cable vs Cat8.1 Ethernet Cable
One is an ISO standard whose rating depends on connectors almost nobody fits; the other is a data-centre cable whose headline speed evaporates past 30 metres. Neither is the obvious answer for an ordinary building, and the comparison is useful mostly for explaining why.
Cat 7 is rated for 600 MHz and 10 Gigabit across 100 metres, fully shielded, and defined around GG45 and TERA plugs. Terminated in RJ45, as every retail cord is, it can only certify to the Cat 6a class, because the plug is the limit. Its shielding earns its keep in electrically noisy installations and adds stiffness everywhere else.
Cat 8.1 is rated for 2,000 MHz and 40 Gigabit, is TIA-recognised, and keeps the RJ45 connector - which is why it looks like the sensible upgrade in a listing. Its limit is distance: 30 metres at any speed, which makes its 10 Gigabit reach less than a third of Cat 7's. It is built for the link between a switch and a server in the same rack.
So the higher-numbered cable is the shorter one, and the shielded European standard is the one you cannot certify with normal plugs. Both are heavy, both are stiff, and both are frequently bought for a house where Cat 6a would do the same job more cheaply and more flexibly.
If a buyer genuinely needs 25 or 40 Gigabit within 30 metres over RJ45, Cat 8.1 is the only one of these that delivers it. If a buyer has a shielded ISO installation with GG45 or TERA connectors, Cat 7 is correct and already specified. Every other case - which is nearly every home and office - belongs to a cable that is on neither side of this page.
Editor’s note
Cat 7's problem is that it was standardised around a connector ecosystem that never arrived in the mass market. ISO did the engineering properly, the shielding is real, and in a plant room running alongside motor cabling it does exactly what it was designed to do. But a class defined around plugs that almost no installer stocks is a class that mostly lives on cable drums and in product listings, and the listings are where it does damage: sellers use the number as a badge while fitting the same connector they would fit to a cheaper cord.
Cat 8.1 is the more honest product and the more widely misunderstood one. It keeps the familiar plug, it is recognised by the American standards body rather than only the international one, and it genuinely delivers what it claims - inside a rack. The compromise is that its distance ceiling is not a soft limit you can lean on; it is the design point of the whole category. Buy it for a short, fat pipe between two machines in the same room and it is excellent. Buy it to wire a house and you have paid for a stiff, heavy cable that will do no more than a thinner one on any run long enough to matter.
Anyone whose actual question is how to get better Wi-Fi upstairs should walk past both of these and go looking at access points instead.
Head-to-head points: every spec is scaled between these products only, so a product can score high here and modestly on its own page, where the VS Score measures it against the median of its class.
Where the Cat7 Ethernet Cable beats the Cat8.1 Ethernet Cable
- A much higher reach at top speed ?100 m vs 30 m
- A much higher 10 Gigabit reach ?100 m vs 30 m
- S/FTP (braid over foiled pairs) Typical shielding ?S/FTP (braid over foiled pairs) vs F/UTP (foil screen)
Where the Cat8.1 Ethernet Cable beats the Cat7 Ethernet Cable
- A much higher maximum data rate ?40 Gbps vs 10 Gbps
- A much higher bandwidth ?2,000 MHz vs 600 MHz
- Has 25G / 40G Ethernet ?
- Has native RJ45 connector ?
Key real-world differences
The spec sheet pulls in both directions. These are the gaps big enough to shape the decision — with the actual figures, and what each one means in real-world use.
- Maximum data rateSpeed & reach10 Gbps vs 40 Gbps — 4× more for the Cat8.1 Ethernet Cable
The fastest Ethernet speed this cable category is rated to carry.
- Native RJ45 connectorPower & connectorsNo vs Yes — only the Cat8.1 Ethernet Cable has it
The category is defined to terminate in a standard RJ45 (8P8C) plug. Categories that are not need GG45 or TERA connectors to meet their rating.
- BandwidthSpeed & reach600 MHz vs 2,000 MHz — 3.3× more for the Cat8.1 Ethernet Cable
The signal frequency the cable is tested to; more headroom means more speed and fewer errors on a long run.
- Typical shieldingConstruction & shieldingS/FTP (braid over foiled pairs) vs F/UTP (foil screen) — advantage Cat7 Ethernet Cable
How the cable is screened against interference. Unshielded is cheaper and more flexible; foil or braid screens protect the signal near motors, mains runs and dense cable bundles.
Which one should you buy?
There is no single answer — it depends on what you will actually use it for. Match your priority to the pick below.
- Best for speed & reach Cat8.1 Ethernet Cable takes the category 77 to 57 — driven by maximum data rate (10 Gbps vs 40 Gbps).
- Best for construction & shielding Cat7 Ethernet Cable takes the category 100 to 40 — driven by typical shielding (S/FTP (braid over foiled pairs) vs F/UTP (foil screen)).
- Best for power & connectors Cat8.1 Ethernet Cable takes the category 100 to 56 — driven by native RJ45 connector (No vs Yes).
- The safe all-rounder Cat8.1 Ethernet Cable wins 2 of 4 categories and tops the overall VS Score at 80.
Where each one falls short
Cat7 Ethernet Cable
- Maximum data rate: 10 Gbps vs 40 Gbps
- Native RJ45 connector: No vs Yes
- Bandwidth: 600 MHz vs 2,000 MHz
- 8 specs are unreported (shown as Unknown) and excluded from its scores.
Cat8.1 Ethernet Cable
- 10 Gigabit reach: 100 m vs 30 m
- Reach at top speed: 100 m vs 30 m
- Typical shielding: S/FTP (braid over foiled pairs) vs F/UTP (foil screen)
- 7 specs are unreported (shown as Unknown) and excluded from its scores.
What matters to you?
Drag the sliders to weight each category and re-rank the products to suit your priorities.
Score breakdown
Speed & reach
Construction & shielding
Power & connectors
Standards & status
Specs last verified October 11, 2026Cat7 Ethernet Cable: 20 of 28 specs verified (71%)Cat8.1 Ethernet Cable: 21 of 28 specs verified (75%)Unverified specs show as Unknown — never estimated, never scored
What reviewers say
The bottom line
Take Cat 8.1 if the run is short, the equipment at both ends really does negotiate multi-gigabit over RJ45, and the cable never leaves the rack or the room it starts in. That is a narrow brief, and inside it nothing else on this page competes.
Take Cat 7 only when you are extending a shielded installation that already has the right connectors and grounding in place - which is to say, when somebody else made this decision years ago and you are matching it.
For everything else, and that means most homes and most offices, the honest answer is that neither of these is the cable you want. The deciding factor is not bandwidth at all. It is termination: whichever of them you buy, the plug crimped on the end sets what you actually get.