Apparently Windows XP by default does not recognize the Barton chips as having 512k L2 Cache. Here’s a little registry tweak to fix it!
Go to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SessionManager\MemoryManagement.
Find the DWORD entry: SecondLevelDataCache. If entering it as hexadecimal 256KB = 100 and 512KB = 200 in hexadecimal, and so on.
Hope this helps :D
Cr4iG