I recently bought a new gaming desktop with built-in Wi‑Fi. The router is roughly 20–30 feet away through several walls, but my phone and previous laptop could use the router's 5 GHz network from the same room at around 60–100+ Mbps. The desktop's built-in adapter gets only about 4–10% signal strength, barely detects the 5 GHz network, and performs poorly even on 2.4 GHz. The external antenna is connected and has been repositioned several times, and I have already reinstalled the Wi‑Fi and chipset drivers.
I also tried an ASUS USB Wi‑Fi 6 adapter on an extension cable. It detects more networks and reports roughly 60–70% signal strength, but speeds are still often below 10 Mbps. The 5 GHz network may not appear, may connect without internet, or may cause the adapter to reset. Other devices in the same location have no trouble, so I'm unsure whether the issue is the antenna, the PC case, USB interference, drivers, power management, or defective hardware. What should I test next, and is a PCIe Wi‑Fi card or Ethernet my best solution?
5 Answers
If possible, test with a different antenna or a borrowed router/access point in the same room. Also compare a speed test over Ethernet. That separates an internet-service issue from a Wi‑Fi issue. Given that multiple nearby devices work normally, the most likely causes are a loose or damaged antenna connection, poor antenna placement, USB interference, or a defective onboard wireless card—not the internet connection itself.
Check for motherboard BIOS and chipset updates as well as the wireless driver. BIOS updates can fix wireless, USB controller, and power-management problems. If the built-in adapter remains weak and a known-good PCIe card still performs badly, test the PC temporarily near the router. Good performance there would confirm a placement or antenna problem; poor performance would point more strongly to defective hardware or software.
First, make absolutely sure the two external antenna connectors that came with the PC are attached firmly to the back of the wireless card. Without them, desktop Wi‑Fi can be nearly unusable. Also inspect the antenna and connectors for damage. Reinstalling drivers won’t help if the antenna lead or internal wireless card is faulty.
The small USB adapter may not have enough antenna performance for a difficult location. A quality PCIe Wi‑Fi card with a remote, magnetic antenna base is usually much better than either built-in desktop Wi‑Fi or a tiny USB nano adapter. Place the antenna on top of the desk and install the current driver from the adapter manufacturer.
An extended antenna helped me too. The internal antenna in my laptop had failed, and the external adapter worked much better once it was positioned away from the chassis.
Try moving the antenna away from the case and above the desk instead of leaving the small screw-on antennas behind or underneath the PC. A metal case, wall, desk, and nearby power cables can block or distort the signal. Disable Wi‑Fi power saving, test both bands, and try a different USB port for the external adapter. USB 3 ports and cables can create interference, so keep the adapter and its cable away from the computer and other electronics.
The antenna is connected, but I’ll check both connectors and the cable more carefully in case something was damaged when I repositioned it.