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<< If you can change the multiplier at all, it is unlocked >>
Ok, I never unlocked my XP 1900+ (retail) and I can change the multiplier in the BIOS. I get the same max setting as him. I am using a MSI K7T266 Pro2 Motherboard. When I had my XP 1700+ (OEM) I could not change the multiplier in the BIOS. It wasn't even selectable. With the 1900+ Retail I can change it. Any ideas why this is? >>
The CPU itself is probably ignoring the changed multiplier settings. Check CPUID to see if it actually worked. If it does work, then you've somehow been buying Athlon MPs...