The Alpha 21164 was replaced by the Alpha 21164A as Digital 's flagship microprocessor in 1996 when a 400 MHz version became available in volume quantities .
The final Alpha 21164 , a 333 MHz version , was announced on 2 October 1995 , available in sample quantities .
The version   was replaced by the version   as Digital 's flagship microprocessor in 1996 when a 400 MHz version became available in volume quantities .
The final Alpha 21164 , a 333 MHz version , was announced on 2 October 1995 , available in sample quantities .