Compaq AlphaServer ES40, Service Manual

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System Overview 1-5
Model Variants
AlphaServer ES40 systems are offered in two models. The entry-level model
provides connectors for four DIMMs on each of the memory motherboards
(MMBs) and connectors for six PCI options on the PCI backplane. To upgrade
from Model 1 to Model 2, you replace the PCI backplane and the four memory
motherboards.
Model 1 Model 2
1–4 CPUs 1–4 CPUs
Up to 16 DIMMs
(4 DIMMs on each MMB Up to 32 DIMMs
(8 DIMMs on each MMB)
6 PCI slots 10 PCI slots
Common Components
The following components are common to all ES40 systems:
•
Up to four CPUs, based on the 21264 Alpha chip
•
Memory DIMMs (200-pin)
•
Floppy diskette drive (3.5-inch, high density)
•
CD-ROM drive
•
Two half-height or one full-height removable media bays
•
Up to two storage drive cages that house up to four 1.6-inch drives per cage
•
Up to three 735-watt power supplies, offering N+1 power
•
A 25-pin parallel port, two 9-pin serial ports, two universal serial bus (USB)
ports, mouse and keyboard ports, and one MMJ connector for a local console
terminal
•
An operator control panel with a 16-character back-lit display and a Power
button, Halt button, and Reset button