Processor Modules - Compaq AlphaServer DS20E Reference Manual

System Overview 1-15

Processor Modules

The system supports up to two processor modules that can be installed on the
system board. Each processor module contains a 21264 microprocessor. The
21264 microprocessor is a superscalar chip with out-of-order execution and
speculative execution to maximize speed and performance. It contains four
integer execution units and dedicated execution units for floating-point add,
multiply, and divide. The chip also has an integrated instruction cache and a
data cache. Each cache consists of a 64 KB two-way set associative, virtually
addressed cache divided into 64-byte blocks. The data cache is a physically
tagged, write-back cache.
Each processor module contains 4 MB secondary B-cache consisting of late-
write synchronous SDRAMs (synchronous dynamic random access memory)
that provide low latency and high bandwidth. Refer to Chapter 8, "Installing
Components," for instructions on installing additional processors.
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Writer: Robert Young Project: DS20E Reference Guide Comments:
Part Number: ER-K8F6W-UA .A01 File Name: b-ch1 System Overview.doc Last Saved On: 10/4/99 1:23 PM