The answer from us to the locked Athlon XP The starting multiplier of the Athlon XP is fixed. We recognized that Athlon XP's FID multiplier was Locked after about 39 weeks in 2003. In these CPUs, it is proved that processing of L3 bridge is invalid. Furthermore, the multiplier changing function of a motherboard is not useful, either. But the cause is not clear. It is very glad that the multiplier of the Mobile Athlon XP-M is not locked.