UGREEN 90340 AX1800 Wi-Fi 6 USB 3.0 Adapter (CM499)
Overview
UGREEN 90340 AX1800 Wi-Fi 6 USB 3.0 Adapter (CM499) is an AX1800-class USB 3.0 adapter with the documented RTL8832AU chipset, internal dual antennas and explicit Windows-first compatibility.
What it does well.
Key features
02 · At a glance
Wi-Fi 6 / 802.11ax. AX1800 is a rounded class label combining up to 1201Mbps on 5GHz and up to 574Mbps on 2.4GHz. The client selects one band for a connection.
1201 + 574Mbps class. A Wi-Fi 6 router or access point is needed for 802.11ax operation; the adapter remains backward compatible with documented a/ac/b/g/n networks.
USB 3.0. Wireless standards: IEEE 802.11ax/a/ac/b/g/n.
RTL8832AU. The retail support statement is Windows 10 and Windows 11; keep this narrower than a generic 'works with any computer' claim.
Every interface and indicator explained
03 · Connector clarity
USB-A 3.0 plug. Carries power and data between the host and Wi-Fi controller. Use a direct USB 3.0 port for full host-link headroom.
Internal dual antennas.
Status indicator. Shows adapter/traffic state under the installed driver; it is not a live speed or signal-strength display.
No 6GHz radio. This is dual-band 2.4GHz + 5GHz Wi-Fi 6, not tri-band Wi-Fi 6E.
No USB pass-through. The connected USB port cannot simultaneously be used for another accessory.
Link-rate ceilings and real throughput
04 · Performance planning
AX1800 is a rounded class label combining up to 1201Mbps on 5GHz and up to 574Mbps on 2.4GHz. The client selects one band for a connection.
Real application throughput is lower than the negotiated PHY link because Wi-Fi shares airtime and adds protocol, encryption and retransmission overhead.
Wi-Fi 6 features can improve efficiency when the router, channel configuration, client driver and surrounding network also support them.
5GHz provides the higher model ceiling but has shorter effective range through walls; 2.4GHz generally reaches farther and is often more congested.
A USB 2.0 connection can constrain performance even though the plug fits. Use USB 3.0 when evaluating the adapter.
What the host, cable or radio route must support
05 · Complete path
A Wi-Fi 6 router or access point is needed for 802.11ax operation; the adapter remains backward compatible with documented a/ac/b/g/n networks.
Install the CM499/RTL8832AU driver for the target operating system when it is not already available.
Choose 5GHz close to the access point for throughput and 2.4GHz where reach matters more.
Keep the adapter clear of the metal rear panel of a desktop, dense cable bundles and high-noise USB equipment.
The router, ISP plan, channel width, congestion and remote server must all support the desired result.
Standards, negotiation and operating roles
06 · Network behaviour
Wireless standards: IEEE 802.11ax/a/ac/b/g/n.
Bands: 2.4GHz and 5GHz only.
Official security material lists WPA3, WPA2, WPA and legacy WEP. Prefer WPA3 or WPA2 where the complete network supports it; WEP is obsolete and insecure.
This adapter creates a client network interface; it is not a router, modem or guaranteed wireless repeater.
Ceiling, not a promise
A port, radio or USB label is a signalling ceiling. Real performance depends on the complete path, protocol overhead, local conditions and the devices at both ends.
Compatible devices and systems
07 · Device fit
Windows 11. Supported by the retail source; install the driver when Windows does not load it automatically.
Windows 10. Supported by the retail source; driver/build compatibility still matters.
Linux. A current UGREEN RTL8832AU family package exists, but distribution, kernel, CPU architecture and Secure Boot determine whether it can be installed.
macOS. Not supported by the primary-source compatibility statement and deliberately not promised.
USB desktops and laptops. Require an available USB-A port and an OS for which a working driver exists.
Use scenarios
08 · Practical value
Wi-Fi 6 desktop upgrade. Add an 802.11ax client interface to a supported Windows desktop without opening the chassis.
Laptop wireless recovery. Use an external adapter while diagnosing a failing internal radio, provided the driver can be installed.
Less-congested 5GHz access. Connect to a compatible 5GHz network when 2.4GHz airtime is crowded.
Conditional Linux workstation. Use only after checking the current UGREEN driver against the kernel, architecture and Secure Boot state.
Setup and usability guidance
09 · Usability
- Download the CM499/RTL8832AU driver before removing an existing working network connection.
- Install according to the target operating system's instructions and restart if requested.
- Connect the adapter directly to a USB 3.0 port with clear physical and radio space.
- Open Wi-Fi settings, choose the intended 5GHz or 2.4GHz SSID and enter the network password.
- Prefer WPA3 or WPA2; avoid enabling WEP merely to accommodate legacy equipment.
- Test near the router first and inspect the negotiated link before comparing internet speed.
Driver and operating-system guidance
10 · Software
The retail support statement is Windows 10 and Windows 11; keep this narrower than a generic 'works with any computer' claim.
Use the official UGREEN package for CM499/RTL8832AU, matching system architecture and release.
UGREEN's current download centre also lists a Linux-family driver, but that does not make every kernel or distribution plug-and-play.
Secure Boot can block an unsigned or locally compiled Linux kernel module.
Do not substitute drivers for similar-looking AX1800 adapters with different chipsets.
Driver discipline
Match this SKU, chipset, operating-system version and CPU architecture. A driver for a similar enclosure can be incompatible with the hardware inside.
What this product does
11 · scope
- Adds dual-band 802.11ax Wi-Fi 6 to a compatible USB host.
- Supports separate theoretical ceilings up to 1201Mbps on 5GHz and 574Mbps on 2.4GHz.
- Uses USB 3.0, internal dual antennas and the documented RTL8832AU chipset.
- Supports WPA3 where the access point, OS and driver are configured compatibly.
What this product does not do
12 · Clear boundaries
- It does not support the 6GHz band and is not Wi-Fi 6E.
- It does not deliver 1,800Mbps to one transfer or add the two bands for one client session.
- It cannot make a slower router, internet plan or server operate faster.
- It does not have macOS support.
- It is not a router, modem, Ethernet adapter or PoE device.
What to do
13 · Best practice
Recommended. Match CM499/90340 and RTL8832AU before downloading software.
Recommended. Use USB 3.0 and give the internal antennas unobstructed placement.
Recommended. Use 5GHz for higher potential speed and 2.4GHz for greater reach.
Recommended. Prefer WPA3 or WPA2 security.
Recommended. Keep the adapter driver and access-point firmware current.
What not to do
14 · Common mistakes
Avoid. Do not market this dual-band adapter as Wi-Fi 6E or 6GHz capable.
Avoid. Do not promise macOS or universal Linux compatibility.
Avoid. Do not add 1201 and 574Mbps as simultaneous user throughput.
Avoid. Do not install an unrelated Realtek or third-party bundle without matching the hardware.
Avoid. Do not treat a negotiated Wi-Fi rate as a guaranteed internet speed.
Warnings and limitations
15 · Read before use
Warning / limitation 1. Wireless results vary with distance, obstacles, interference, channel width, router design and local regulations.
Warning / limitation 2. Use wireless channels and transmit settings permitted in the country of operation.
Warning / limitation 3. Legacy WEP is listed for compatibility but is not considered secure; use WPA3 or WPA2 whenever possible.
Warning / limitation 4. Stop using the adapter if its USB connector is damaged or the enclosure becomes abnormally hot.
Warning / limitation 5. Linux driver installation can require administrator access and kernel-module changes; follow organisational security policy.
Troubleshooting by symptom
16 · Diagnostics
Adapter is absent. Try a direct USB 3.0 port and install the CM499/RTL8832AU driver for the operating system.
Wi-Fi 6 is not shown. Confirm the router has 802.11ax enabled on the selected band and that the current driver is active.
Only 2.4GHz appears. Check the router's 5GHz broadcast, distance, regulatory channel and client driver settings.
Speed is lower than the link label. Distinguish negotiated PHY rate from application throughput, then reduce interference and verify the host uses USB 3.0.
Linux driver will not load. Check kernel version, architecture, build dependencies, module signing and Secure Boot before assuming a hardware fault.
At a glance.
- Brand / model
- UGREEN CM499 / SKU 90340
- Adapter type
- USB dual-band Wi-Fi 6 client adapter
- Chipset
- Realtek RTL8832AU
- Host connector
- USB-A 3.0
- Wireless standards
- 802.11ax/a/ac/b/g/n
- 5GHz link ceiling
- Up to 1201Mbps
- 2.4GHz link ceiling
- Up to 574Mbps
- Antenna
- Internal dual-antenna design
- Security
- WPA3 / WPA2 / WPA; legacy WEP listed
- Retail OS scope
- Windows 10 / Windows 11
- Conditional driver availability
- Linux family package; version-dependent
- macOS
- Not verified / not promised
17 · data
Retail bundles can vary. Ethernet cables, routers, chargers, external power supplies or host adapters are not included unless they appear in the list above.
Questions buyers ask.
What model does this page cover?
This page covers UGREEN CM499, SKU 90340, using the documented RTL8832AU chipset.
What is the highest stated link speed?
The adapter links up to 1201Mbps on 5GHz or 574Mbps on 2.4GHz; AX1800 is a rounded class, not one 1,800Mbps transfer.
Does it need a driver?
Use the current driver when Windows does not load it. Linux is conditional on kernel and distribution; macOS is not promised.
Which hosts or network devices are compatible?
The retail scope is compatible Windows 10/11 USB computers, with conditional Linux driver availability.
Will it make my internet faster?
No. It can remove a client-side bottleneck but cannot exceed the router, ISP plan, congestion or remote service.
Does it support or supply PoE?
No. It is a wireless client adapter with no Ethernet or power-output port.
What do its USB or power connections actually do?
The USB-A plug carries adapter power and data only. It has no charging, video or USB pass-through role.
What cable or radio path should I use?
No Ethernet cable is used; good placement and a compatible dual-band router determine the radio path.
Is warmth normal?
Some warmth is possible during sustained traffic. Disconnect it if heat, smell or instability becomes abnormal.
What should I check first if it does not work?
Verify the driver, USB 3.0 connection, intended radio band, access-point mode and security setting.
What is included in the box?
The base package includes the CM499 adapter and user manual.