Cat5e vs Cat6 (and Cat6A): Which Ethernet Cable Is Right for Your Home?

Cat5e and Cat6 look the same, use the same plugs and fit the same ports. The difference only shows up at speeds above 1 gigabit and on long runs through walls. For most home connections either cable gives you the full speed you pay for — but if you are buying new cable, or wiring rooms you will not open again, the choice is worth a minute. Here is what actually differs.

The Short Answer

For connecting a router, PC, console or TV at up to 1 Gbps, Cat5e is enough, and a cable you already have will work. Cat6 costs a little more and gives you headroom for 5 and 10 Gbps over shorter distances. For new in-wall wiring meant to last, Cat6A is the cable rated for 10 Gbps over the full 100 meters.

Cat5e vs Cat6 vs Cat6A Compared

The 1 and 10 Gbps distances come from Intel’s cable requirements for its 10-gigabit adapters. The 2.5 and 5 Gbps figures come from the IEEE 802.3bz standard (marketed as NBASE-T), which was designed to run multi-gigabit speeds over existing Cat5e and Cat6 cabling up to 100 meters; 2.5 Gbps is the speed specified for Cat5e, and 5 Gbps for Cat6. In a house, cable runs are rarely longer than 30–40 meters, so even Cat6 at 10 Gbps usually reaches.

Will Cat6 Make My Internet Faster?

Usually not. The cable is only the limit when it is slower than everything else in the chain, and Cat5e already carries 1 Gbps. If your internet plan is 500 Mbps or 1 Gbps, and your router, computer and switch have gigabit ports, swapping Cat5e for Cat6 changes nothing you can measure. See how much internet speed do I need.

The cable starts to matter when both ends support more than 1 Gbps: a multi-gig plan (2 Gbps and up), a router with a 2.5G or 10G port, a NAS with fast storage, or a network switch with multi-gig ports. Then Cat6 is the safer choice for 5 Gbps, and Cat6A for 10 Gbps over long runs.

A slow wired connection is more often a damaged cable, a loose plug, or a port that negotiated 100 Mbps instead of 1 Gbps. If your PC shows “100 Mbps” for the link speed, the cable probably has a broken pair — see Ethernet cable not working. Very old Cat5 (without the “e”) is not rated for gigabit and is worth replacing.

How the Cables Differ Physically

All three have four twisted pairs of copper wire. Cat6 adds tighter specifications and, in many cables, a plastic spline — a cross-shaped divider down the middle that keeps the pairs apart. That reduces crosstalk, the interference between pairs, which is what lets Cat6 run at a higher frequency. The price is a thicker, stiffer cable that is harder to bend around tight corners and to fit into crowded conduit.

Cat6A goes further to reduce alien crosstalk — interference between neighboring cables in a bundle — which is the main obstacle to 10 Gbps over 100 meters. It is thicker again and the most expensive of the three.

Shielding (labels like UTP, FTP, STP) is a separate choice. Home cables are normally unshielded (UTP), which is fine unless the cable runs next to power lines or motors.

Which One to Buy

A patch cable from the router to a PC, console or TV: Cat6 if you are buying new, since the price difference for a short cable is small. Cat5e you already own is fine at up to 1 Gbps.

Wiring a house or running cable through walls: Cat6 at minimum; Cat6A if you want the wiring to support 10 Gbps everywhere for years. Replacing in-wall cable is far harder than buying a better one now. If a wall jack stops working, see Ethernet wall port not working.

Flat or very thin cables are convenient under carpets and door gaps, but they often give up some of the twisting and separation that the category relies on. Use them for short runs.

Skip “Cat7” and “Cat8” for home use. Cat8 is meant for short links between equipment in data centers, and Cat7 is not part of the TIA cabling standards that RJ45 home networks follow. Neither makes a home connection faster than Cat6A.

If you cannot run cable at all, see Ethernet vs Wi-Fi and what is a powerline adapter.

Mixing Cables and Checking What You Have

You can mix categories freely — all use the same RJ45 connectors. A link simply performs at the level of its weakest part: a Cat6 cable plugged into a Cat5e wall jack behaves like Cat5e.

To check what you have, read the print on the cable jacket: it lists the category, such as “CAT5e” or “CAT6”, often with the standard (TIA-568) and the wire gauge. On Windows, Settings → Network & internet → Ethernet shows the link speed in the connection’s properties. A link speed of 1000 Mbps means the cable is doing its job for a gigabit connection; 100 Mbps on gigabit equipment points to a faulty cable or plug.