On paper, a laptop WiFi card is about the easiest upgrade there is. Small card, standard slot, one screw, two thin antenna wires clipped on top. Swap it and you've got better WiFi.
A lot of the time that's exactly how it goes. But every now and then the new card isn't detected, Windows shows no WiFi at all, or the laptop won't even start. The card isn't faulty. It's just the wrong kind of card for that laptop.
There are three usual suspects.
1. It's a CNVi card
Intel makes two types of WiFi card that look practically identical.
A normal card has the whole WiFi system on the card itself. Put it in a compatible slot and it'll work in almost any laptop.
A CNVi card only has part of it. Intel moved the rest into the laptop's processor and chipset, so the card does the radio side and the laptop's Intel chipset does the rest. That makes the card cheaper, but it means it only works in laptops with an Intel chipset that supports CNVi.
The Intel Wireless-AC 9560 is the classic example. It's a CNVi card. Put it in an AMD laptop, or an older Intel one without CNVi support, and it won't work, even though it slots in perfectly.
To make it more fun, there are different generations of CNVi and they don't mix:
- Intel 9560 and 9462 are first-generation CNVi, for Intel 8th and 9th gen laptops
- Intel AX201 and AX211 are newer CNVi cards, for later Intel generations
- Intel AX200 and AX210 are normal cards, not CNVi, and work in a lot more laptops
So "Intel WiFi 6 card" doesn't tell you enough. An AX201 and an AX200 are both WiFi 6, but only one of them will work in an AMD laptop.
2. The laptop has a whitelist
Some laptops will only accept WiFi cards the manufacturer has approved. The approved list lives in the BIOS, and anything that isn't on it gets blocked.
This was common on older Lenovo ThinkPads and HP laptops. A ThinkPad with an unapproved card would stop at start-up with error 1802: Unauthorized network card is plugged in. HP laptops showed 104-Unsupported Wireless Network Device Detected and wouldn't start until the card came out.
The manufacturers' reasoning was that the card and the laptop's antennas had to be certified together for wireless regulations. Whatever the reason, you end up with a perfectly good card the laptop refuses to use.
Newer business laptops are generally a lot more relaxed about it. But if you're upgrading an older machine, check for a whitelist before you buy.
3. Wrong size or connector
Laptops have used a few different WiFi card formats over the years:
- Mini PCIe, the older and wider card, in laptops from roughly ten years ago and older
- M.2 2230, the small card in most modern laptops (22mm wide, 30mm long)
- Soldered WiFi, on some thin laptops, where it's built into the motherboard and can't be replaced at all
The antenna wires matter too. Newer M.2 cards use a smaller antenna connector than the older ones, so an old laptop's antenna wires might not clip onto a new card without an adapter.
Same laptop, different card
This is where people get caught out. Plenty of laptops shipped with more than one WiFi card depending on the unit.
The Lenovo ThinkBook 15-IML is one. Some came with an Intel 9560 (Lenovo part 01AX768) and some with a Realtek 8822CE (02HK701). Both work fine in that laptop. But if you're upgrading, it helps to know which one you've got, and whether the card you want will actually work in it. A serial number lookup on Lenovo's support site will show you which card your unit shipped with.
Before you buy a card, check this
- Does your laptop even have a removable card? Look up the model, or have a look under the bottom cover
- Is it M.2 2230 or the older Mini PCIe?
- Intel or AMD? CNVi cards only work in supported Intel laptops
- If you're buying CNVi, which Intel generation is the laptop?
- Is it an older ThinkPad or HP that might have a whitelist?
If you're not sure, a normal card like the Intel AX200 or AX210 is the safest upgrade, because it doesn't depend on the laptop's chipset. And if you're just replacing a dead card, the same part number as the original is the safest bet of all.
Quick answers
Why is my new WiFi card not detected?
Usually because it's a CNVi card in a laptop that doesn't support CNVi, the BIOS is blocking unapproved cards, or the card's format or antenna connectors don't match the laptop.
Will an Intel 9560 work in an AMD laptop?
No. The Intel 9560 is a CNVi card and needs a supported Intel chipset. It won't work in AMD laptops or older Intel laptops without CNVi support.
What does error 1802 mean on a ThinkPad?
The BIOS has found a WiFi card that isn't on Lenovo's approved list and has stopped the laptop from starting. It's mainly an older ThinkPad thing.
Which WiFi card is the safest upgrade?
A normal, non-CNVi card such as the Intel AX200 or AX210 works in the widest range of laptops. Replacing a card with the same part number is the safest option of all.
Not sure which card your laptop takes? Send us the model and serial number and we'll tell you what'll work.