Cat 5 vs Cat 6 Cable (2026 Guide) | Speed Differences, Costs & Best Uses UK Quick answer
The main difference between Cat 5 and Cat 6 Ethernet cables is speed and bandwidth .
Cat 5e supports up to 1 Gbps at 100 MHz. Cat 6 supports up to 10 Gbps at 250 MHz (for up to 55 m).
In 2025, Cat 6 cables cost around £1 to £3 per metre , about 20 % more than Cat 5e (£0.50–£2 per metre), but they’re faster, better shielded and future-proof.
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Authored by: Ally Cox (Business Technology & B2B Services Specialist 10+ Years’ Experience)
Reviewed by: James Ward (Telecoms Specialist, 12+ Years Experience)
Last Updated: January 2026
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cat 5 and cat 6 differences
Contents
Applications and Limitations
Installation & Compatibility: Do I Need Special Connectors?
Our Thoughts on Cat 5 vs Cat 6 Cables
CAT5e vs. CAT6 Cost
Cat 6a vs Cat 7: Are They Worth It?
Cat 5 Cables: Applications and Limitations
Feature Cat 5 (Legacy) Cat 5e (Enhanced) Cat 6 (High-Speed)
Max Speed 100 Mbps 1 Gbps 10 Gbps (up to 55 m)
Bandwidth 100 MHz 100 MHz 250 MHz
Best For Basic home use Homes & small offices Gaming & business networks
Crosstalk Protection Low Medium Excellent
Max Distance 100 m 100 m 55 m (10 Gbps), 100 m (1 Gbps)
Backward Compatible ✅ ✅ ✅
Typical Price (2025) £0.50–£1 /m £0.75–£2 /m £1–£3 /m
💡 Tip: If you need long runs (> 55 m) or 10 Gbps support, consider Cat 6a (500 MHz) or Cat 7 (600–1000 MHz).
Name Frequency Ethernet Signal Supported Connector
Cat 5
1 – 100MHz
10/100 Base T
8p8c, RJ45
Cat 5e
2 – 100MHz
10/100 Base T. Gigabit Ethernet
8p8c, RJ46
Cat 6
3 – 250MHz
10/100 Base T. Gigabit Ethernet
8p8c, RJ47
Cat 6a
4 – 500MHz
10/100 Base T. Gigabit Ethernet, 10Gig Ethernet
8p8c, RJ48
Cat 7
5 – 600MHz
10/100 Base T. Gigabit Ethernet, 10Gig Ethernet
GG45, TERA
Cat 7a
6 – 1000MHz
10/100 Base T. Gigabit Ethernet, 10Gig Ethernet
GG45, TERA
Installation & Compatibility: Do I Need Special Connectors? RJ45 Compatibility: Cat 5e, Cat 6 and Cat 6a all use standard RJ45 connectors , so you don’t need new routers or switches.
Shielded vs Unshielded:
UTP = common home use; cheaper. STP = better for industrial or high-interference areas (power lines, servers, data centres).
Hardware Check: To get true 10 Gbps, your router or switch must support 10G Ethernet (look for “10GBase-T”).
✅ 1. RJ45 Connectors: Compatibility Across Cat 5e, Cat 6, and Cat 6a
Cat 5e, Cat 6, and Cat 6a cables all use RJ45 connectors, so they are interchangeable with most standard networking ports.
If you’re upgrading from Cat 5e to Cat 6 or Cat 6a, you do not need to change your networking hardware—your existing ports will work just fine.
🔧 2. Shielded (STP) vs. Unshielded (UTP) Cables: When Do You Need Different Connectors?
Unshielded Twisted Pair (UTP) cables are the most common and work with standard RJ45 connectors.
Shielded Twisted Pair (STP) cables reduce interference and require shielded RJ45 connectors with metal grounding to maximise performance.
If your network is in a high-interference area (e.g., near power lines, industrial equipment, or data centres), STP cables and shielded connectors are recommended.
⚡ 3. Does Cat 6a Require Different Connectors?
While Cat 6a still uses RJ45 connectors, some older RJ45 connectors may not support its higher performance.
To fully utilise 10Gbps speeds, use Cat 6a-rated connectors, which have better shielding and support higher frequency signals (500MHz vs. 250MHz in Cat 6).
🏠 4. Will My Router or Switch Work with Cat 6a?
Most modern routers and switches support Cat 6 and Cat 6a without issue.
However, older networking equipment (especially those limited to 100Mbps) may not take full advantage of higher-speed cables.
So to achieve 10Gbps speeds, ensure your router, switch, or modem supports 10G Ethernet.
🔌 5. Should I Upgrade My Ethernet Wall Jacks?
If your home or office is wired for Ethernet, check that your wall jacks and patch panels support higher-speed Cat 6a or Cat 7 connections.
Older Cat 5 jacks may limit speed, even if you use a faster cable.
💡 Our takeaway:
If you’re upgrading from Cat 5e to Cat 6 or Cat 6a, your current RJ45 connectors will likely still work.
For best performance with Cat 6a and higher, use shielded connectors and ensure your hardware supports 10Gbps speeds.
Cat5e vs. Cat6 Cost
Cable Type Typical Price Range (per metre) Best Use
Cat 5e £0.50 – £2 Home and SMBs needing 1 Gbps
Cat 6 £1 – £3 High-speed business and gaming
Cat 6a £1.50 – £3.50 10 Gbps over 100 m runs
Cat 7 £3 – £6 Data centres & AV environments
Average UK retailers ( e.g. Screwfix, Amazon UK 2025 ): Cat 6 ≈ 20 % more than Cat 5e but offers ~10× speed.
Cat 6a vs Cat 7: Are They Worth It?
Feature Cat 6a Cat 7
Max Speed 10 Gbps (100 m) 10 Gbps (100 m), 40 Gbps (≤ 50 m)
Bandwidth 500 MHz 600–1000 MHz
Shielding Optional STP / UTP Required STP
Connector RJ45 GG45 / TERA
Backward Compatible ✅ ❌
Price (UK 2025) £1–£3.50 /m £3–£6 /m
✅ Verdict: Cat 6a is the sweet spot — 10 Gbps speeds, future-proof and uses standard connectors. 🚫 Cat 7 is overkill for most homes and offices and requires non-standard connectors.
When to Use Each Cable
Cat 5e: Budget home networking & standard broadband. Cat 6: Gaming PCs, VoIP, and 4K streaming. Cat 6a: Future-proof business installations & 10 Gbps infrastructure.
Cat 7: Professional audio-visual and data centre applications.
Other useful links about Cat 5 vs Cat 6 cables:
Our Thoughts on Cat 5 vs Cat 6 Cables For most UK users, Cat 6a wins on speed, value and compatibility. Cat 5e is fine for budget home setups, but Cat 6/6a gives you headroom for faster broadband and gaming. Unless you’re running a data centre, skip Cat 7 as it’s expensive and not IEEE standardised.
Cat 5 vs Cat 6 Cable FAQS 1️⃣ What’s the difference between Cat 5 and Cat 6 cables?
Cat 5 supports 100 Mbps; Cat 5e supports 1 Gbps; Cat 6 supports up to 10 Gbps at short distances. Cat 6 has thicker insulation and less signal interference (crosstalk).
2️⃣ Can I use Cat 6 instead of Cat 5e?
Yesm, Cat 6 is backward compatible with Cat 5e ports and connectors (RJ45). You’ll get better performance even on older equipment.
3️⃣ How fast is Cat 6 Ethernet in 2025?
Up to 10 Gbps (55 m runs) and 1 Gbps over 100 m. To reach 10 Gbps, use Cat 6a and a 10G router or switch.
4️⃣ Does Cat 6 improve Wi-Fi speed?
Indirectly… faster Ethernet reduces bottlenecks between your modem, router and access points, helping Wi-Fi perform closer to its rated speed.
5️⃣ Do I need special connectors for Cat 6a?
Still RJ45, but use Cat 6a-rated shielded connectors for 10 Gbps speeds and longer runs.
6️⃣ How much does Cat 6 cabling cost to install in the UK?
Expect £100 – £200 per room for home runs or £300 – £700 for small office setups with faceplates and patch panels (including labour).
7️⃣ Is Cat 7 worth it over Cat 6a?
No for most users. It’s pricier, requires non-standard connectors and offers little real-world benefit over Cat 6a.
🏁 Final Takeaway If you’re upgrading your network in 2025:
💪 Cat 6a is the best balance of price, speed & future-proofing. 💸 Cat 5e is fine for 1 Gbps home internet. 🚀 Cat 7 / 8 only make sense for specialist enterprise setups.
👉 Need business-grade connectivity? Compare leased line providers here.
A Handy Youtube Guide About Cat 6 Cables
Other useful links about leased lines include:
Hi, I’m Ally Cox , a senior copywriter and blogger at CompareYourBusinessCosts.co.uk, the UK’s trusted platform for comparing business services.over a decade of experience in the B2B sector, I specialise in simplifying complex topics like leased lines, VoIP, business energy, HR and payroll solutions, accounting software, and EPOS systems .HR, copywriting, and business operations- from clocking-in systems to card machines and office technology .informed, confident decisions when choosing products and services that improve efficiency and save money.