HP AlphaStation DS20 User Manual

Compaq AlphaServer DS20 SystemsTechnical Summary

8Memory Features• The memory ECC scheme is designed to providemaximum protection for user data. The memory schemecorrects single-bit errors and detec

9ClusteringA cluster is a loosely coupled set of systems that behaves (isaddressed and managed) like a single system, but provideshigh levels of avail

10PerformanceCOMPAQ has an ongoing program of performanceengineering, using industry-standard benchmarks that allowcomparisons across major vendors’ s

11 AlphaServer DS20 System DiagramsPK-0317-9842311. StorageWorks shelf for hard disk drives2. SCSI CD-ROM drive3. Optional removable media drive bay4.

12System Features at a GlanceTable 1 provides a quick reference to features of the Compaq AlphaServer DS20 systems.Table 1 AlphaServer DS20 FeaturesC

13Physical CharacteristicsTable 2 details basic physical characteristics of the system.Table 2 AlphaServer DS20 Physical CharacteristicsShipping Dime

Features may differ among operating environments. Performance may varydepending on configuration, application, and operating environment.Compaq believ

Contents1System OverviewFeatures and Benefits2ArchitectureSystem Block Diagram3System BoardComponent and Connector Locations4Third-Generation Alpha Ch

1Compaq AlphaServer DS20 SystemsThe Compaq AlphaServer DS20 system delivers highperformance for business, technical, and scientificapplications at an

2ArchitectureDriving the design for this system was the objective tomaximize the potential of the Alpha 21264 chip. Rather thanimplementing the tradit

3System BoardThe interconnect switch is implemented on the system boardby the chipset consisting of one C-chip, two P-chips, and eightD-chips. This c

4Third-Generation Alpha ChipThe Alpha 21264 microprocessor (EV6) is a superscalarsuperpipelined implementation of the Alpha architecture. TheAlpha 21

5MemoryThe switch interconnect can move a large amount of data overtwo independent memory data buses. Each memory bus is 256bits wide (32 bytes). Th

6I/O ImplementationTwo separate 64-bit PCI buses are provided, each with threeslots. As can be seen in the block diagram, the C-chip controlsboth PCI

7StorageThe AlphaServer DS20 system offers up to 10 internal storagedevices including a CD-ROM drive, floppy diskette drive, oneadditional 5.25-inch r