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:

Epox EP-9NPA+Ultra 4GB Vista

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

Epox EP-9NPA+Ultra 4GB Vista

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.

Epox EP-9NPA+Ultra 4GB Vista

20 Replies to “EPoX EP-9NPA+Ultra 939 Motherboard and 4GB of RAM”

  1. This will help me too. Thanks! I will upgrade as soon as DDR1 becomes affordable again. Ahh, I love this Motherboard since three years now! It’s a pitty Epox no longer exists…

  2. Me again. I want to thank you again for your hint and leave a post for all those “Epox 9NPA+ Ultra” + “4GB RAM” – Googlers. Now I’m also at 4GB with my good old 9NPA+ Ultra running Vista 64 and there is no need to upgrade to 775 or AM2 for me left ATM. I will just wait another two years and then will see if I really really neeeed a new computer – if the board not dies in the meantime 🙂
    BTW DDR1 is cheaper then ever! Just bought original Aeneon at 22.- Euro per gig in Europe. That’s half the price of two, three months ago. This one is doublesided but runs without any problem in all 4 slot!
    Ah, and Epox now is Suppox…

  3. Sol: That’s great. That should be plenty of RAM to run stuff. My 9NPA+ box is also serving me well. Unless you’re unlucky, these things should last a long time. My home “server” is a Dell Optiplex GX200 that I bought about 7 years ago. It still works great as a file server.

  4. Great to see there are still other 9NPA+ users out there extending the life of their boards. I’ve been using EPOX for 8 years, and have had the 9NPA+ for just about 3 years now. I went dual core about a year ago (64 X2 3800+) and have it running 24/7 @2900MHz with ZERO issues (water cooled). My 2GB of OCZ Platinum is pushing 241MHz on the bus, also with zero issues. Having finally gone to Vista x64, I see how it totally munches through RAM, and like many others have done searches seeing if the 9NPA+ can handle all 4 sticks with no issues. I just bought another 2GB pair of the same style OCZ Platinum for a fifth of what I paid for it three years ago! A very small investment to make in order to extend the life of the best motherboard/system I ever owned. Not the latest and greatest of course, but I still score 5.9 Windows Experience Index across the board except for CPU which is 5.3. I have no reason to upgrade any time soon with the performance this board puts up… Thank you Epox, and wish you were still in the game…

  5. I must reinstall the WIN XP after upgrade to Opteron 170 but i don’t know where to find right functioanal drivers for this MB (

  6. 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

  7. 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.

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