CONFIG_ALPHA_SABLE is not available for thedefaultarchitecture x86.
Result is shown for architecture alpha

Sable

modulename: sys_sable.ko

configname: CONFIG_ALPHA_SABLE

Alpha system type
└─>Sable
In linux kernel since version 2.6.12  
Digital AlphaServer 2000 and 2100-based systems.

source code: