Gigabit is most useful for reducing large-transfer waits and sharing capacity across busy users. Above one gigabit, check the entire hardware path. A single one-gigabit Ethernet link cannot carry a two-gigabit transfer to one device.
Once you know the speed you need, use our London broadband overview to compare local coverage and networks.
Calculate a benefit you can actually use
For a decimal 100 GB download, the ideal transfer calculation is 800,000 megabits divided by the achieved Mbps. That gives about 44 minutes 27 seconds at 300 Mbps, 14 minutes 49 seconds at 900 Mbps and 6 minutes 40 seconds at 2,000 Mbps.
These are arithmetic lower bounds, not measured provider performance. Add real-world limits such as server throughput, overhead, concurrent traffic and storage. If you rarely make a transfer that large, the everyday benefit may be smaller than the headline comparison suggests.
Consider the household, not only one speed test
A fast service can be shared by several devices even when no individual device reaches the full package speed. That can matter in a household with overlapping downloads, cloud backups and entertainment.
Distinguish that aggregate benefit from a single-device target. If the goal is to download at more than a gigabit on a workstation, the route to that workstation needs to support it. If the goal is several users staying comfortable, total usable capacity may matter more.
Trace the full path for multi-gig
Check the network handover, router's internet port, router's local ports, any switch and the device's adapter. Multi-gig Ethernet includes rates such as 2.5 Gbps and 5 Gbps, but a router can have a fast internet-facing port with slower local ports.
A capable cable alone does not upgrade the ports at either end. Verify the negotiated link speed and the equipment specifications. Check USB docks and adapters too: they can be the overlooked link between a fast router and a computer.
- Is the router's internet port fast enough?
- Is the local port used by the device equally capable?
- Does any intermediate switch support the target speed?
- Can the device, adapter and storage keep up?
- Can the remote download server deliver enough data?
Do not confuse Wi-Fi marketing totals with one device
A wireless product's advertised aggregate capacity does not describe the sustained internet throughput of every connected client. Device capability, signal conditions and shared airtime still matter.
Before spending on a multi-gig package for a wireless laptop, test the current local connection and read both devices' capabilities. A wired workstation and a phone in another room may experience the same subscription very differently.
Compare the incremental cost
Calculate the price difference over the minimum term, including any router or adapter purchases. Ask how often the saved transfer time would matter. A small difference may be worthwhile for a heavy user; a large equipment spend may not be.
Check upload at the same time. Someone sending files could benefit more from a higher-upload package than from a faster download tier. Choose the change that removes a demonstrated limit rather than buying capacity you cannot yet reach.
Your questions, answered.
Is 900 Mbps very different from 1,000 Mbps?
The theoretical capacity difference is about 11%. Real results depend on the package, path and equipment, so compare the quoted service and cost rather than the label alone.
Can several devices share a two-gigabit package through gigabit ports?
Potentially, if the router and upstream connection support the aggregate load. Each individual gigabit link still has its own limit.
Sources & further reading
Official information behind this guide. Links checked 29 October 2026; individual datasets retain their stated reference dates.