Categories: Technology

EPoX EP-9NPA+Ultra 939 Motherboard and 4GB of RAM

If you have an EPoX EP-9NPA+Ultra 939 NVIDIA nForce4 Ultra ATX AMD Motherboard, and you installed 4GB of RAM, the BIOS may only see 3407872K Total Memory:

To enable the BIOS to see the full 4GB of RAM, do the following:

  • Enter the BIOS Setup Utility (reboot and press Del key).
  • Choose Advanced Chipset Feature, then DRAM Configuration
  • Change “S/W memory hole Remapping” to Enabled
  • Change “H/W memory hole Remapping” to Enabled

If you have Windows XP or Windows Vista 32-bit, the operation system will not see the full 4 GB anyway. The “fix” is to upgrade to Vista 64-bit or just live with whatever amount of RAM the OS can use. My Vista 32-bit installation reports 3327 MB of total memory.

Chinh Do

I occasionally blog about programming (.NET, Node.js, Java, PowerShell, React, Angular, JavaScript, etc), gadgets, etc. Follow me on Twitter for tips on those same topics. You can also find me on GitHub. See About for more info.

View Comments

  • Michal: Try looking on nvidia.com for the chipset drivers and Realtek.com for the onboard audio. Chinh

  • hey
    can anyone point me to epox ep 9npa+ ultra driver. epox site dosnt work and all i can give on nvidias site is video drivers.
    i have searched high and low
    please help

  • Hi. Just stumbled on this page, particularly PJ#s thread at no. 8

    I've had a EPoX EP-9NPA+Ultra for 8 years. It's on 18 hours a day (used about 10 hours) and except for heavy graphic work is fine. Now in Jan 2014 I'm looking to replace due to XP end of life. But even a mid priced 2012 processor and mobo doesn't good terribly good value. Oh, definitely going to Linux as well.

    So I thinking about doing what PJ did and getting a second hand 64 X2 3800+ CPU. Plus maybe a SSD, going from 3GB to 4GB, and perhaps a better graphics board.

    Just wonder how long this great mobo will last.

  • It's March 2020. My epox mobo is still running windows 7 64 bit. I am trying to upgrade to Windows 10 but have not solved the compare exchange 128 issue yet.

    • Hi Edge 737, Wow that's great that you still have the Epox motherboard running. The thing must be at least 15 years old by now! Hopefully you'll find a fix for the exchange 128 issue. Chinh

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