Cat6 vs Cat7 vs Cat8: Differences and When You Need Them
Cat7 and Cat8 cables are often sold as upgrades to Cat6, but they are built for different jobs. This guide compares Cat6, Cat6A, Cat7 and Cat8 so you can see when the higher categories are worth it and when they are not.
Comparison at a glance
| Cat6 | Cat6A | Cat7 | Cat8 | |
|---|---|---|---|---|
| Bandwidth | 250 MHz | 500 MHz | 600 MHz | 2000 MHz |
| Top speed | 1G (10G short) | 10G | 10G | 25G / 40G |
| Distance at top speed | 100 m (10G ~55 m) | 100 m | 100 m | 30 m |
| Construction | U/UTP or screened | U/UTP or screened | S/FTP only | S/FTP / F/FTP |
| Standard | TIA and ISO | TIA and ISO | ISO Class F only | TIA Cat8 / ISO Class I and II |
| Typical use | Offices, CCTV | 10G, Wi-Fi 6/7 | Screened 10G links | Data-centre switch links |
Cat6 vs Cat7
Cat7 is fully shielded (S/FTP) and tested to 600 MHz, but it is an ISO class, not a TIA category, and its native connectors (GG45 or TERA) are not RJ45. Cat7 cable terminated with RJ45 connectors performs at Cat6A level. For 10G over 100 m, a Cat6A system is the more widely supported choice; Cat7 suits projects that specify fully shielded cable.
Cat6 vs Cat8
Cat8 is tested to 2000 MHz and supports 25GBASE-T and 40GBASE-T, but only over channels up to 30 m. It is designed for short links between switches and servers in data centres. For desks, cameras and access points, Cat8 brings no speed gain over Cat6 or Cat6A because the equipment runs at 1 to 10 Gbit/s.
Is Cat8 good for gaming?
It works, but it is not faster for gaming. Home routers, consoles and PCs run at 1 to 2.5 Gbit/s, which Cat6 handles easily. Latency depends on the network, not the cable category.
Which should you choose?
- Cat6 for most office, CCTV and home networks.
- Cat6A for 10G over 100 m, Wi-Fi 6E/7 access points and long service life.
- Cat7 where a fully shielded ISO Class F installation is specified.
- Cat8 for 25G/40G links up to 30 m inside data centres.
FAQ
Is Cat8 backward compatible?
Cat8 with RJ45 connectors (ISO Class I) works with Cat6 and Cat6A equipment, but the link runs at the speed of the slowest part.
Is Cat7 better than Cat6A?
Cat7 has more shielding and bandwidth, but with RJ45 connectors it delivers the same 10G performance as Cat6A, which is easier to install and widely standardised.
See also the Cat5e vs Cat6 vs Cat6A guide. Browse Cat6, Cat6A, Cat7 and Cat8 cables.