I recently bought a new gaming desktop with built-in Wi‑Fi, but its wireless performance has been poor from the beginning and has recently become almost unusable. My home has a Netgear router broadcasting separate 2.4 GHz and 5 GHz networks. It is roughly 20–30 feet away in another part of the house, with several walls between it and my room. There is also a closer Wi‑Fi 6 router that supports 5 GHz.
The desktop's built-in adapter detects the 2.4 GHz network and the closer router very weakly, while the Netgear 5 GHz network often does not appear at all. The included external antenna is connected and extended. Performance was initially decent, but became much worse after I unplugged and repositioned the antenna. I have reconnected it several times and reinstalled the Wi‑Fi and chipset drivers.
I then bought a USB Wi‑Fi 6 adapter and placed it on a USB extension cable away from the computer. This adapter detects more networks and reports around 60–70% signal strength, but actual speeds are usually below 10 Mbps and often much lower. Connecting to the Netgear 5 GHz network is especially unreliable: it may not appear, connect without internet, disconnect, or cause the adapter to reset. On the rare occasions it connects, speeds are still terrible.
Phones and other devices in the same room have no trouble using the Netgear 5 GHz network and reach roughly 60–100+ Mbps. My previous laptop also worked reliably from this exact location. I am trying to determine whether this is caused by antenna placement or damage, USB or internal interference, drivers, power settings, router compatibility, or defective hardware. Any troubleshooting suggestions would be appreciated, since running Ethernet would be difficult.
5 Answers
The small USB adapter may not be a meaningful upgrade, especially if it is close to USB 3 ports or the computer itself. USB 3 can create radio interference, so using a short extension to place the adapter away from the PC is reasonable, but try different USB ports and keep it away from other cables and electronics. Install the adapter’s current driver directly from the manufacturer rather than relying only on Windows Update.
First, make absolutely sure the original external antenna is installed correctly. Prebuilt desktops sometimes ship with the antenna in the accessory box, and the tiny screw-on connectors can feel attached even when they are not making a good connection. Inspect the antenna and its cable for damage, then test with the case positioned so the antenna is exposed rather than tucked behind a desk or wall. Also check the adapter’s power-management settings and disable the option that lets Windows turn it off to save power.
For consistently better results, a PCIe Wi‑Fi card with a remote antenna base is usually preferable to both motherboard Wi‑Fi and tiny USB adapters. The antenna can sit on top of the desk instead of behind a metal case or under a desk. Before buying one, test the computer temporarily in the same room as the router. If speeds become normal there, the issue is signal path or antenna placement; if they remain poor, suspect the adapter, drivers, BIOS, or hardware.
Testing next to the router makes sense. That should help separate a location problem from a defective adapter or computer.
Look for physical causes too: a damaged antenna connector, a loose internal antenna lead, or a poorly shielded cable can cause exactly this pattern. Keep power strips and extension cords away from the antenna, move nearby electronics, and try another known-good antenna if one is available. If the built-in adapter remains weak even beside the router, the prebuilt may have a defective wireless card or antenna assembly and should be inspected under warranty.
Check for BIOS/UEFI updates from the desktop manufacturer as well as current Wi‑Fi and Bluetooth drivers. Integrated wireless hardware can be affected by firmware, USB-controller settings, and power-management changes. It is also worth testing different bands and channels, since the 5 GHz network may be using a channel the adapter handles poorly. If every adapter performs badly while phones work normally, the desktop’s hardware or its local interference is more likely than the router itself.
The antenna is connected, but I’ll inspect the connectors and cable more closely and test with the case moved into a more open position.