Enabling up to 24x in multiplier for modded AthlonXP
Eversor 6 May 2004

Note: You should only do this if you are familiar with bridge modding, or if you know the risks you are taking by modding your cpu, it may occur permanent damage by doing a bad mod, and you'll void your warranty by doing that. Neither OCWorkbench or me will take any responsibility if a CPU is damaged during the process. If you have no problems with that, go ahead :-)

The Athlon XP-M Multi BIOS that is currently being distributed in this forum introduces one great feature, that is the ability to control the multiplier of Mobile Athlon XPs.

This will enable us to control multiplier of locked AMD Athlon and Duron CPU´s, without having to change it in windows or through bridge modding, tough some modding is still required.

Like i explained in my previous article here there is a way to change all AMD socket A cpu´s (except pre-palomino cpu´s) into mobile Athlons, this is NECESSARY for the multiplier option of this bios to be enabled and working, otherwise it won´t appear.

Also you will only be able to select multipliers until 11x unless the modding to the L6 bridges, wich control the multiplier is made, to open till 24x. This mod is also described in the 3^rd page of the previous article.

UPDATE: There´s a new and much easier way to have multipliers opened and selectable in BIOS up to 24x, just paint the 2^nd L5 bridge, the one left to the L5 Mobile bridge.

From my experience the 3x and 4x multiplier, tough selectable are useless, since the computer won't boot the OS, and if selected in windows through CPUMSR will cause a reboot. It may be related with the max multiplier, which I'm currently using as 12x, if higher is available, trough modification of L6 bios you may lose lower multipliers like 5x and 6x, tough i haven't tested it yet.

Resuming:

• Modification of CPUs from desktop to Mobile version of AMD cpu´s is required for this feature to be available, and to multipliers be accessible in bios, and in CPUMSR, only until 11x.

• To be able to select multipliers higher than 11x in both bios and CPUMSR, the maximum multiplier bridges, L6, MUST be cut (process is explained here), this will open until 24x if made right.

Bottomline:

You should only perform this if you want to have your locked cpu with multiplier selection, or if you want to be able to change multipliers on-the-fly in windows.

This is a great overclocking feature (kudos to ASRock) which we hope to see available from other manufacturers and better implemented, in a few months i hope this is available without any modification being made to the cpu.

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