Table 1. Comparison of Alpha 21164 and 21264 Processors
21164 (ev5,ev56) 21264 (ev6, ev67)
--------------------------------------------------------------------------------------------
Dual issue Quad issue
--------------------------------------------------------------------------------------------
Simple branch predictor Tournament branch predictor
--------------------------------------------------------------------------------------------
Direct mapped, write-through cache Two-way set associative cache
--------------------------------------------------------------------------------------------
Simple instruction scheduling rules Complex instruction scheduling rules
--------------------------------------------------------------------------------------------
Roughly twice the bandwidth of the 21164
New instructions: WH64, CTLZ, CTTZ
--------------------------------------------------------------------------------------------
Copyright © 1994 - 2018 Linux Journal. All rights reserved.