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Registry tweaks, tricks & hacks to optimize, enhance and secure Microsoft Windows.

DirectDraw and Direct3D Settings (Windows 98/Me/2000/XP)
Category: Home > Hardware > Video and Graphics

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These DirectX settings allow you to change some of the DirectDraw and Direct3D video acceleration parameters.

Open your registry and find or create the key below.

Create a new DWORD value for each optional item from the list below and set it to "1" to enable the setting or "0" to disable it.

  • DisableAGPSupport - Disable AGP support
  • DisableMMX - Disable MMX processor extensions
  • DisableWiderSurfaces - Disable Wider Surfaces support
  • DisableInactivate - Disable dual-head video card debugging
  • EnablePrintScreen - Enable Print Screen capture
  • ModeXOnly - Use Mode-X for older video cards
  • ShowFrameRate - Display the frame rate (if supported)
  • DisableNoSysLock - Disable long-duration locks on video memory
  • ForceNoSysLock - Force use of long-duration locks on video memory
  • EmulationOnly - Enable software emulation layer for older video cards
Open the [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D] key and change the value of DisableDP2 to "1" to disable Direct3D, or "0" to enable it.

Open the [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Direct3D\Drivers] key and change the value of SoftwareOnly to "1" to use software emulation or "0" to disable it.

Restart Windows for the change to take effect.

Registry Editor Example
|NameTypeData|
|(Default)REG_SZ(value not set)|
|DisableAGPSupportREG_DWORD0x00000000 (0)|
|DisableMMX REG_DWORD0x00000000 (0)|
|DisableWiderSurfaces REG_DWORD0x00000000 (0)|
|DisableInactivate REG_DWORD0x00000000 (0)|
|EnablePrintScreen REG_DWORD0x00000001 (1)|
|ModeXOnly REG_DWORD0x00000000 (0)|
|ShowFrameRate REG_DWORD0x00000001 (1)|
|DisableNoSysLock REG_DWORD0x00000000 (0)|
|ForceNoSysLock REG_DWORD0x00000001 (1)|
|EmulationOnly REG_DWORD0x00000000 (0)|
-
|HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw|
-

Settings:
System Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DirectDraw]
Type: REG_DWORD (DWORD Value)
Value: (0 or 1)

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.

Last Modified: July 24, 2002

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