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Optimize Large Second Level Cache (Windows NT/2000/XP) Popular

Windows is optimized for a 256KB secondary cache by default. With most computers now having L2 caches larger than that it pays to take the time to change the setting to correspond to the size of the cache memory installed.

This tweak can be easily applied using WinGuides Tweak Manager.
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Open your registry and find the key below.

Create a new DWORD value, of modify the existing value, named "SecondLevelDataCache" and set it to equal your L2 cache size in Kb's (decimal).

Restart Windows for the change to take effect.

Note: This tweak is only useful for older processors with the cache located external to the CPU.

Registry Editor Example
|(Default)REG_SZ(value not set)|
|SecondLevelDataCacheREG_DWORD0x00000200 (512)|
|HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session ...|
Registry Settings
System Key: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\
Memory Management]
Value Name: SecondLevelDataCache
Data Type: REG_DWORD (DWORD Value)
Value Data: Cache (in Kb) using Decimal Notation

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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: October 4, 2002