Service manual

1-20 AlphaServer 4000/4100 Service Manual
1.10 CPU Types
AlphaServer 4000 and 4100 systems can be configured with one of several CPU
variants. Variants are differentiated by CPU speeds and the presence or
absence of a backup data cache external to the Alpha microprocessor chip.
Figure 1-14 CPU Module Layout
PKW0422C-96
Typical Uncached CPU
Typical Cached CPU
Alpha Chip Composition
The Alpha chip is made using state-of-the-art chip technology, has a transistor count
of 9.3 million, consumes 50 watts of power, and is air cooled (a fan is on the chip).
The default cache system is write-back and when the module has an external cache,
it is write-back.