If you only have a few devices, you’re overpaying if your main PC link speed is significantly below your ISPs claimed speed.

Here’s how I get link speeds on Windows:

wmic nic where netEnabled=true get name, speed

powershell "Get-NetAdapter | select interfaceDescription, name, status, linkSpeed"

If you run a CAT5E/CAT6 ethernet cable from your PC to your router, you should see a link speed of 1000000000 (same as 1000Mbps or 1Gbps).

Can you post a screenshot of everything? Can’t tell what the link is. Your PC to the router? Your router to the WAN?

It is about right I think they say about 70% to 80% unless your ISP says you should get 600 then it will be a call to them.

In many cases, no. The link speed of your PC is dictated by the network interface in use. Gigabit Internet service with a gigabit Ethernet interface would be an example where they would match.

In your case, you may be using a 802.11ac connection with a 40 MHz channel.

If your router, has a setting to use 80 MHz channels, this can increase the link speed by up to 2x under ideal conditions. Actual results will depend on your environment.

Keep in mind that overall speeds will be dictated by the speed of the slowest link. Switching to an 80 MHz channel may double your PC’s link speed to, say, 800 Mbps but access to the Internet will be capped at 600 Mbps.

BTW, WiFi link speeds are much higher than the actual speed due to the high amount of overhead inherent in WiFi. A rule of thumb is to expect real world speeds to be 50% less than the link speed for WiFi. Ethernet is very different. Overhead is much lower, around 5%. So, even with an 800 Mbps link speed over WiFi, actual speeds will be around 400 Mbps, give or take.

Ideally your link speed would be at least as high as the speed you’re paying your ISP for, if it’s not then you are theoretically not able to fully utilize the bandwidth you’re paying for.

The speed you’re paying your ISP for refers to the connection between the ISP and whatever their demaraction point is at your home, typically this would be their modem.

The link speed you’re seeing here appears to be a WiFi connection between your PC and your router.

Sometimes you have a modem and a router, but it is increasingly common for ISPs to issue modem/router combo units these days (i.e. where a single device both terminates the incoming connection, whether that be DSL, cable, fiber, etc., as well as provides Ethernet and WiFi connections for your devices).

In most cases, you are responsible for all networking beyond the modem/router (which would include the 400 Mb/s link speed you’re seeing here). If possible, it’s always preferable to use hardwired Ethernet since it’s performance and reliability is much better than WiFi.

Troubleshooting WiFi connections is a much deeper topic since there’s so much that goes into it, but in general, you want to make sure that both your devices and your router support the latest WiFi standard, you’re using a channel with the least amount of interference, and you have your router physically located such that it covers the maximum area.