PAE patch updated for Windows 8.1

This patch allows you to use more than 3/4GB of RAM on an x86 Windows system. Works on Windows Vista SP2, Windows 7 SP0, Windows 7 SP1, Windows 8 and Windows 8.1. Instructions and source code included.

Download: (82010 downloads)

Before using this patch, make sure you have fully removed any other “RAM patches” you may have used. This patch does NOT enable test signing mode and does NOT add any watermarks.

Note: I do not offer any support for this. If this did not work for you, either:

  • You cannot follow instructions correctly, or
  • You cannot use more than 4GB of physical memory on 32-bit Windows due to hardware/software conflicts. See the comments on this page for more information.
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42 Responses to PAE patch updated for Windows 8.1

  1. AGVirt says:

    Thanks a lot!!!!!

  2. P Sv Rns Srikanth says:

    Thank you so much for this updated Patch for Windows 8.1. I am eagerly waiting for this. 100% works on Windows 8.1 (32-bits(X86)) all versions :)

  3. alex says:

    it wont boot after:

    @echo off
    TITLE …::: Win8 32-bit Unlocker Script :::… by: Wiwi-maX
    color 30
    echo Script use PatchPae v2.
    cd %Windir%\system32

    C:\PatchPae2\PatchPae2.exe -type kernel -o ntoskrnx.exe ntoskrnl.exe
    C:\PatchPae2\PatchPae2.exe -type loader -o winloadp.exe winload.exe
    bcdedit /copy {current} /d “Windows 8 (Unlocked)”
    bcdedit /set {current} kernel ntoskrnx.exe
    bcdedit /set {current} path \Windows\system32\winloadp.exe
    bcdedit /set {current} nointegritychecks 1
    bcdedit /default {current}
    bcdedit /set {bootmgr} timeout 2

    shutdown.exe -r -f -t 5 -c “RAM 2GB’s Limit Removed.”

  4. Ferdinand N says:

    WOWWW…. thanks alot man…

  5. Andre says:

    Works great – thank you so much!

    After getting the new boot entry like {12345678-abcd-1234-abcd-123456789abc},
    you can copy your {…} to the associated commands in your personal “readme.txt”.
    For example:
    bcdedit /set {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} kernel ntoskrnx.exe
    bcdedit /set {12345678-abcd-1234-abcd-123456789abc} kernel ntoskrnx.exe
    Then work with copy&paste to insert 100% correct commands to your Command prompt window.

  6. slalalavka says:

    C:\Windows\System32>C:\WherePatchPaeIs\PatchPae2.exe -type kernel -o ntoskrnx.ex
    e ntoskrnl.exe
    Unsupported kernel version.

  7. not working, when patch windows 8.1 restart loop

  8. Jackson says:

    I had the boot loop as well on 8.1. I just let it keep rebooting, eventually it worked after maybe 7 or 8 attempts. I made the mistake of having updates pending on the reboot. Thought that’s why it might have given problems. Seems fine now.

  9. Stefan says:

    It works. Thank you! :)

  10. Nina Goa says:

    It didn’t worked, thanks for this bullshit. Now I’ve newly installed my OS :-(

  11. DavidB says:

    Thank you very much.

    But disabling the integrity checks is a stability and security risk.
    Is there any way to patch the ntkrnlpa.exe/ntoskrnl.exe file so the digital signature would check out ok…?

    Best regards, DavidB

  12. PaVink says:

    Thank you so much, Wen Jia!
    Installation was simple and straightforward.

    I had dug up a similar patch (albeit way more complicated than this one!) under Win 7, and I hated going back to 3-something GB under Win 8 when I switched over. I am so happy being back at 4 GB now. Great job – thank you for your efforts and proving (once again) that all the Microsoft language about the 4GB limitation is just bullshit.

  13. Erik says:

    Hola, probé el script en 8.1, y todo se ejecutó perfecto, pero al reiniciar empezó a dar pantallazos -como de incompatibilidad de driver o resolución de video- y apareció la linda pantalla azul de volcado de memoria. Alguién sabe si hay alguna corrección que realizar antes?

  14. Sepp Meier says:

    d:\patchpae2\PatchPae2.exe -type kernel -o ntoskrnx.exe ntoskrnl.exe

    Sorry, at the first command I get “Unable to copy file: access denied” (Win 8.1 pro)
    Of course I started the cmd as administrator.
    Only the TrustedInstaller has the right to write.

  15. intika says:

    Thanks a million :)
    i am testing that

  16. Sepp Meier says:

    The patch works :-)
    But not with an on-board graphic card! I see only pixels on my screen.

    It would be better for testing to change the wait time in the boot menu to 30 seconds to have enough time to select the normal boot if something goes wrong.

  17. Caleb says:

    I can patch but its not giving me the new boot code after I patch So I do not know what to use for: bcdedit /set {12345678-abcd-1234-abcd-123456789abc} kernel ntoskrnx.exe

    How would I get the new boot code if this one does not give on patch & or the winload.exe patch?
    Running windows 7 ultimate Sp1 on an AMD FX-8350 8 core 4.00 GHz with 8 gig ram 1TB HD.

  18. sergey says:

    thanks. maybe add in next version gui?

  19. Shenzie says:

    Patch works great…with one small problem: When the PC starts, sound almost always has various patterns of static and/or hash. (Rarely, sound starts w/o this.) Resetting Windows Audi Service one or more times (not consistent) clears it—the hash pattern changes with every service reset. AudioSrv.dll is byte-for-byte identical to correct MS version.

    This is 8 GB on Win7 Home Premium—all other programs and functions work perfectly.

    Any advice on how to solve the audio problem?


  20. JonathanA says:

    Thank you very much! Worked like a charm.

  21. miken says:

    I’m seeing some folks talked about how they got stuck in a loop when they rebooted their machine after successfully installing the patch. I had the same problem. Never got it to work. I would get the blue screen with an error saying KMODE_EXCEPTION_NOT_HANDLED. Eventually, I would get lucky and have a chance to choose to start the non patch windows. Anyone have luck resolving this?

  22. Terry says:

    It would seem that the patch can be affected by video drivers. It did not work using intel HD onboard graphics, neither did it work with a new Nvidia GEForce 610 card using the supplied video driver. It would work however using basic 640×480 VGA mode driver.

    I got the patch to work perfectly by installing an older 2 year old GEForce 610 driver from another computer running Windows 7 for which the patch worked perfectly.

    The recent update to Windows 8.1 (April 8) did not cause any problems.

  23. Pingback: サバンナ速報 » 【超速報】Windows XP(32bit)でメモリー4GBの壁が突破される【PAE】

  24. PaVink says:

    Unfortunately, for me the patch stopped working after installing the 8.1 Update. :-)

    I had disabled/removed the patch before applying the 8.1 upgrade (just to be sure), then applied it again after the upgrade. When booting, I get a windows error (Windows 8-style blue screen) related to the video driver and the system freezes at that point.

    I then downloaded the latest video drivers (nVidia GeForce), but that that doesn’t make any difference.

    Too bad – I did like my 1 GB of extra memory! Anybody seeing same/similar issues …?

  25. abdulrahmanok says:

    pls upade it to win 8.1 >> this version don’t work

  26. Terry says:

    Hi PaVink, it may be worthwhile finding and installing older nvidia drivers, and see if the patch then works.
    The Nvidia website has some older drivers.

    If the patch works in safe mode, or when the Nvidia drivers are uninstalled and you use a standard VGA display, then it confirms a driver problem.

    If you go through the comments on the Windows 7 page, (wj32 gives a link at the top of this page), the common failure theme is video drivers.

  27. Pingback: サバンナ速報 » 【超速報】Windows XP(32bit)でメモリー4GBの壁が突破される【PAE】★2

  28. devDark says:

    After applying this patch to the new kernel ntkrnlpa.exe version 6.1.7601.18247 (win7sp1_gdr.130828-1532) Windows 7 after booting with the modified kernel goes to pseudo cyclo rebooting, specifically continuously displays shutdowning.
    But this patch still works fine with the old kernel ntkrnlpa.exe version 6.1.7601.17514 (win7sp1_rtm.101119-1850) without any problems.

    Files are attached to this post.

    • swishee says:

      Do you know how to change your kernel to an older version to get it to work?

      • Yes, above are attached link to the older version of patched and successful worked kernel, but this kernel was used with the older Nvidia driver, so I believe that this problem isn’t in the kernel, this is more like a bugs in the latest GPU drivers such as Nvidia / Intel.

  29. Gary says:

    It worked! Thanks! :)

  30. Jeff says:

    hi, can you please confirm this still works with win8.1 UPDATE 1, it was going fine for me until 1 day I got a bsod, so I was wondering if it had to be updated to make sure nothing changed in UPDATE 1, I wonder if the kernel version changed?!

  31. Terry says:

    The patch works ok for me with Win8.1 + update 1 and “old” Nvidia drivers but if you have automatic updates set then your system may download and install updated video drivers which may be the cause of the problem.

    • Jeff says:

      thanks for the update, I only use AMD, nothing Nvidia in my system, but possibly updates overrode the patched kernel

  32. Tpfumefx says:

    Does this patch work only for ms windows, or along with practical apps like 3dsmax photoshop etc… I mean can other applications other than windows make the use of more than 4gb Like computer graphics apps for exemple?

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