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This will prevent your ATI Radeon HD 4890 graphics card from being listed as an "Unknown Device" in Windows 7

An ATI Radeon HD 4890 graphics card may appear as an unknown device in Windows 7 after reinstalling your operating system. This is because only built-in device drivers remain on your computer; B. Driver for keyboard, mouse and CD / DVD drive. On the other hand, peripheral devices such as an Ethernet card, a network adapter and a video controller are listed as unknown devices or problematic devices and require the device drivers to be reinstalled.

A video controller such as the ATI Radeon HD 4890 graphics card cannot be used without installing the required device driver. In this case, the computer only uses the Microsoft OpenGL driver (integrated Windows driver). This leads to slower or poorer graphic displays and limited resolution options. To fix this, the correct driver for your graphics card must be installed either from the installation CD or by downloading the latest online version. If you’re not careful, you may be installing the wrong or incompatible driver, causing even more problems and frustration.

Here are the three practical steps you can take to fix this problem and prevent the ATI Radeon HD 4890 graphics card from appearing as an unknown device in your Windows 7 operating system.

1. Confirm the identity of your unknown device

Before downloading the device drivers, make sure that the problematic unknown device is actually the ATI Radeon HD 4890 card. This is very important, especially if there is more than one unknown device in the device manager of your PC. You can do this by checking your device’s manufacturer and device IDs:

  1. Click the Windows button
  2. Click on Control Panel
  3. Click System and Security
  4. Click Device Manager
  5. Right-click the unknown device
  6. Click on Properties
  7. Click on Details
  8. Choose Device Instance Path
  9. Search for VEN _ **** and DEV _ ****. If it is Radeon HD 4890, you must have VEN_1002 (Vendor ID = 1002), DEV_9460 (Device ID = 9460) from the alphanumeric data.

2. Confirm the Windows 7 type (32-bit or 64-bit).

This is very important to avoid downloading incompatible device drivers.

  1. Click the Windows button
  2. Enter “System” in the search field
  3. Click on System
  4. Search by system type: Either “32-bit operating system” or “64-bit operating system”

3. Download process from the official AMD website

In the upper right part of the homepage, directly under the “Support and drivers” tab, you can see the part that says “Find drivers”. Just hover over this area and the “Download Driver” form will appear. There are four fields with drop-down options that you must choose from before you can download the correct device drivers. You must specify the category of your device in the first field. Since it is a graphics card, the correct category is “desktop graphics”. The second field is labeled “Product Line” for which the graphics card series must be specified. In our case, it is the Radeon HD series.

The “product model” is given in the third field, and the correct choice is Radeon HD 48xxx Series PCIe. The last field is very important, in which you specify the “operating system type” to avoid incompatibility problems. In our example it is 32-bit Windows 7. If you click on “Show results”, you will be directed to the download page where you can download the information. You can download AMD Catalyst packages or “Single downloads” and Carry out “optional downloads”. The Catalyst Software Suite is the package that contains other device drivers compatible with the Radeon HD 4890. You can download the display driver alone for the individual downloads. More downloads can be found on the “Optional Downloads” tab. If you are unsure, it is safest to download the entire package.

Let’s go through this three-step process again, which you can use to avoid unknown device problems in Windows 7. Before downloading the device driver for the ATI Radeon HD 4890 graphics card, you need to ensure the identity (name and model) of your unknown device using the IDs to prevent incorrect device drivers from downloading. Second, check the operating system type to avoid incompatibility problems. Third, be very careful when choosing options that are required to find the correct drivers on the manufacturer’s website. Always remember to read the descriptions of the downloadable files carefully, for example: Catalyst Software Suite only or display drivers.

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