Theoretical determination of the CPU Clock Ratio locking
AMD Top Secret
Public Machine-Specific Registers
Undocumented Machine-Specific Registers
About the Clock Control Register
Theoretical determination of the Clock Ratio locking
Thermal and electrical specification of the AMD64 CPU's
Thermal and electrical specification of the 7th Gen. CPU's

This table explains the theoretical relationship between core revisions and clock ratio locking of the AMD processors*

Updated: 03/27/2004




L2 Cache

Major Rev.

Minor Rev.

Clock Ratio Locking

Athlon XP 1700+ JIUHB 0681h 256K 1 14 disabled
Athlon XP 1800+ JIXIB 0681h 256K 1 13 enabled
Athlon XP 2000+ AIXJB 0681h 256K 1 13 disabled
Athlon XP 2200+ AQYFA 06A0h 256K 0 11 enabled
Athlon XP 2500+ AQYFA 06A0h 512K 0 2 enabled
Athlon XP 2500+ AQXDA 06A0h 512K 0 12 disabled
Duron 1400 MHz MIUGA 0680h 64K 0 4 disabled
Duron 1600 MHz MIAGA 0680h 64K 0 14 enabled
Duron 1400 MHz MIXIB 0681h 64K 1 13 enabled/disabled
Duron 1400 MHz MIXIB 0681h 64K 1 14 enabled

* This is the part of information that was practicaly determined using Barton CRC tool. If your processor is missing in this table, please send us a BCRC report.

Central Brain Identifier