System information

System Configuration and Setup
6-17
6.2 CPU, Memory, and Motherboard
Brief descriptions of the CPU daughter board, memory cards, and motherboard and
its connectors are provided in this section.
6.2.1 CPU Daughter Board
The CPU daughter board provides:
• The Alpha 21164 microprocessor
• Backup cache
• ALCOR-2 chipset, which provides logic for external access to the cache for
main memory control, and the PCI bus interface
• SROM code
6.2.2 Memory Modules
AlphaServer 800 system architecture supports from 32 Mbytes to 2 Gbytes of
memory, although at product introduction, 1 Gbyte of memory is supported.
Memory options consist of four dual in-line memory modules (DIMMs) and are
available in the following variations:
• 32-Mbyte (consisting of four 8-Mbyte DIMMs)
• 64-Mbyte (consisting of four 16-Mbyte DIMMs)
• 128-Mbyte (consisting of four 32-Mbyte DIMMs)
• 256-Mbyte (consisting of four 64-Mbyte DIMMs)
• 512-Mbyte (consisting of four 128-Mbyte DIMMs)
• 1-Gbyte (consisting of four 256-Mbyte DIMMs)
The motherboard has eight DIMM connectors, grouped in two memory banks
(0 and 1) (Figure 6-3).
Memory Configuration Rules
Observe the following rules when configuring memory on AlphaServer 800 systems:
• At least one memory bank must contain a memory option.
• A memory option consists of four DIMMs (0, 1, 2, and 3).
• All DIMMs in a bank must be of the same capacity and part number.