Asus P4S800-MX Motherboard Drivers: Complete Download Guide

To get all Asus P4S800-MX motherboard drivers installed correctly, you need four separate packages: chipset, audio, LAN, and VGA (if you are using the onboard graphics), installed in that specific order for the most reliable result.

The P4S800-MX is a Socket 478 motherboard built around the SiS 661FX chipset, designed for Pentium 4 and Celeron processors of that generation. Because it predates driver auto-installers, you have to grab each component driver separately and install them one at a time. Here is the full process, step by step.

Step 1: Install the Chipset Driver First

The SiS chipset driver has to go on before anything else, since it sets up the core communication between the CPU, memory, and other onboard controllers that the other drivers depend on.

1. Download the SiS 661FX chipset driver package matching your Windows version.
2. Run the installer and restart when prompted.
3. Confirm in Device Manager that there are no more unknown “PCI Device” or “System Device” entries related to the chipset.

Step 2: Install the LAN Driver

The P4S800-MX uses a Realtek or SiS-branded onboard LAN controller depending on the production batch. Check Device Manager under “Other devices” for an Ethernet Controller entry, then install the matching driver so you have a working internet connection for the remaining steps.

Step 3: Install the Audio Driver

Onboard audio on this board is typically a Realtek AC’97 or similar codec. Install this after networking is confirmed working, since some installers check for internet access during setup for codec updates.

Step 4: Install the VGA Driver (If Using Onboard Graphics)

If you are not using a separate graphics card, install the SiS Mirage integrated graphics driver last. Skip this step entirely if you have a dedicated video card installed, since the integrated graphics driver is not needed in that case.

Per Anthony V., who is a hardware refurbishment technician at a computer recycling nonprofit, “We still get donated Socket 478 machines with P4S800-MX boards, and installing the chipset driver before anything else is the difference between Windows recognizing every device cleanly versus fighting a pile of unknown devices in Device Manager.”

Failed Install / Troubleshooting

If any of the four driver packages fails to install, or Device Manager still shows warning icons afterward, use the manual method:

1. Open Device Manager (right-click My Computer or This PC, choose Manage, then Device Manager).
2. Find the device with a yellow warning icon, right-click it, and choose Update Driver.
3. Select Browse my computer for drivers, then Let me pick from a list of available drivers on my computer.
4. Click Have Disk, browse to the extracted driver folder for the relevant component, and select the .inf file.
5. Complete the wizard and restart if prompted, then repeat for any remaining unknown devices.

• If the chipset installer itself refuses to run, right-click it and choose Run as Administrator, and check that you downloaded the correct package for your exact Windows version and bit depth.
• If onboard audio installs but produces no sound, check Windows’ Sound settings to confirm the correct playback device is set as default, since some AC’97 installs add a duplicate disabled entry.
• If the network driver installs but there is no connectivity, verify the physical cable and try a different Ethernet port on your router or switch before assuming the driver is at fault.

Compatible Processors and Memory

Since this is a Socket 478 board, only Pentium 4 and Celeron processors built for that socket will work, not later LGA775 chips. Keep the following in mind:

• Maximum front-side bus speed support depends on your specific BIOS revision, so update the BIOS first if you plan to install a faster CPU than the board originally shipped with.
• RAM is DDR (not DDR2), so make sure any replacement memory modules match the original DDR standard.
• Check the Asus official support page for your board’s exact revision to confirm the maximum supported CPU and memory before buying upgrade parts.

Frequently Asked Questions

What chipset does the Asus P4S800-MX use?

It uses the SiS 661FX northbridge chipset paired with a SiS south bridge, which is why the chipset driver needs to be sourced from SiS rather than Intel or AMD.

Do I need to install drivers in a specific order?

Yes. Chipset first, then LAN, then audio, then VGA (if using onboard graphics). Installing out of order can leave some devices unrecognized until you reinstall in the correct sequence.

Can this motherboard run Windows 10 or 11?

Officially, no. The hardware and available drivers only support Windows XP. Some enthusiasts have gotten limited functionality on later Windows versions using generic drivers, but full compatibility should not be expected.

My onboard sound stopped working after a Windows update. What happened?

Windows updates on legacy systems can sometimes replace a working AC’97 driver with a generic one that has reduced functionality. Reinstalling the original Realtek AC’97 package usually fixes it.

How do I identify my exact board revision?

Check the printed text on the motherboard itself, usually near the PCI slots or the battery, which lists the exact revision number, needed since Asus released more than one hardware revision under this model name.

Conclusion

Setting up all the drivers for the Asus P4S800-MX takes four separate installs done in the right order: chipset, LAN, audio, then VGA. If Device Manager still shows unrecognized devices after that, the manual INF install through Have Disk clears up almost every remaining issue.