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22 facts in comparison
Cat3 Ethernet Cable vs Cat5e Ethernet Cable
This is less a comparison than a demonstration of how far twisted-pair cabling travelled in six years. Cat 3 was rated for 10 megabits over 16 MHz and survives in the standards only for telephone and voice risers; Cat 5e carries 2.5 Gigabit over a full 100 metres and is the default for home and small-office wiring today.
The numbers tell the story on their own. Cat 3 cannot run gigabit Ethernet at all, is limited to the original 15.4-watt PoE class, and is no longer recognised for new data installations. Cat 5e runs gigabit and multi-gig, supports the 90-watt PoE standard, and remains fully current for the majority of what a home network does.
The reason this pairing exists is that Cat 3 is still in buildings. Offices wired in the 1990s, older apartment blocks and anything with a structured telephone system may have Cat 3 in the walls, and it looks like Ethernet cable to anyone who does not check the jacket. Plugging modern equipment into it produces links that negotiate down to 10 megabits, or fail intermittently, or work on short runs and not on long ones.
The only decision this comparison supports is whether existing Cat 3 can be kept. For a telephone extension or a doorbell, yes. For anything that will carry data, no - and the cost of pulling Cat 5e in its place is small against the frustration of leaving it.
Nobody should buy Cat 3 for a new installation, and this page is not suggesting anyone would. It is here so that a building's old wiring can be recognised for what it is, and replaced with the cheapest category that still does everything a modern network asks.
Editor’s note
Cat 5e deserves more respect than its age suggests. It remains the cheapest four-pair cable that does everything a modern home asks of it, gigabit without argument, multi-gig up to an access point, and the full power class for cameras and lighting. It stayed relevant because a later Ethernet standard was written against the cable already sitting in the ceiling rather than against something new, which is an unusual piece of luck for hardware this old. The compromise is a hard ceiling rather than a gradual one: no 10 Gigabit rating at any distance, and no alien crosstalk limits, so it is the wrong thing to pull into a dense commercial bundle.
Cat 3 is not a bad product. It is a finished one. For voice risers, punch-down blocks and low-power devices it remains entirely adequate, and the standards keep it for exactly that. What makes it hazardous is cosmetic. It terminates in the same connector as everything else, so modern equipment plugs in happily and then behaves oddly, negotiating down without explanation or working on a short run and failing on a long one.
The reader who should walk past this page entirely is the one wiring something new. It matters only to people opening a wall in a building older than the equipment they are installing.
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 Cat3 Ethernet Cable beats the Cat5e Ethernet Cable
No standout advantages.
Where the Cat5e Ethernet Cable beats the Cat3 Ethernet Cable
- A much higher maximum data rate ?2.5 Gbps vs 0.01 Gbps
- A much higher bandwidth ?100 MHz vs 16 MHz
- Has Gigabit Ethernet ?
- Has multi-gig (2.5G / 5G) ?
- A much higher Maximum PoE power ?90 W vs 15.4 W
- Has PoE++ (Type 4, 90 W) ?
- Has recognition for new installs ?
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 & reach0.01 Gbps vs 2.5 Gbps — 250× more for the Cat5e Ethernet Cable
The fastest Ethernet speed this cable category is rated to carry.
- BandwidthSpeed & reach16 MHz vs 100 MHz — 6.3× more for the Cat5e Ethernet Cable
The signal frequency the cable is tested to; more headroom means more speed and fewer errors on a long run.
- Recognition for new installsStandards & statusNo vs Yes — only the Cat5e Ethernet Cable has it
Still a current standard that cabling bodies recognise for new structured cabling, rather than a legacy or superseded category.
- Maximum PoE powerPower & connectors15.4 W vs 90 W — 5.8× more for the Cat5e Ethernet Cable
The highest Power-over-Ethernet class IEEE 802.3 permits over this cable category, measured at the switch.
- PoE++ (Type 4, 90 W)Power & connectorsNo vs Yes — only the Cat5e Ethernet Cable has it
Carries the highest PoE class, enough for pan-tilt-zoom cameras, LED lighting and thin clients.
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 Cat5e Ethernet Cable takes the category 100 to 29 — driven by maximum data rate (0.01 Gbps vs 2.5 Gbps).
- Best for power & connectors Cat5e Ethernet Cable takes the category 100 to 44 — driven by Maximum PoE power (15.4 W vs 90 W).
- Best for standards & status Cat5e Ethernet Cable takes the category 100 to 20 — driven by recognition for new installs (No vs Yes).
- The safe all-rounder Cat5e Ethernet Cable wins 3 of 4 categories and tops the overall VS Score at 100.
Where each one falls short
Cat3 Ethernet Cable
- Maximum data rate: 0.01 Gbps vs 2.5 Gbps
- Bandwidth: 16 MHz vs 100 MHz
- Recognition for new installs: No vs Yes
- 8 specs are unreported (shown as Unknown) and excluded from its scores.
Cat5e Ethernet Cable
- No major spec weaknesses in this matchup — the gaps that exist are small.
- 6 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, 2026Cat3 Ethernet Cable: 20 of 28 specs verified (71%)Cat5e Ethernet Cable: 22 of 28 specs verified (79%)Unverified specs show as Unknown — never estimated, never scored
What reviewers say
The bottom line
This is a voice cable measured against a data cable, and treating it as a shopping decision is the mistake the page exists to prevent. Cat 5e is what gets bought; Cat 3 is what gets found. Where old wiring is carrying a telephone extension, a door entry panel or an alarm loop, leave it where it is, because that is the work it was designed for and it will keep doing it indefinitely.
Where anything on the end of it moves packets, replace the run rather than negotiating with it. A link that half works costs more in diagnosis than the replacement cable costs outright, and the trade-off falls entirely on labour. Nobody is choosing between these two on merit. They are choosing between pulling cable now and chasing intermittent faults later.