System Overview 1-13
CPU Card
The system can have up to four CPU cards. The CPU cards are installed on the
system board. Each CPU card contains an EV68 microprocessor, a current im-
plementation of the Alpha architecture.
The microprocessor is a superscalar CPU with out-of-order execution and specu-
lative execution to maximize speed and performance. It contains four integer
execution units and dedicated execution units for floating-point add, multiply,
and divide. It has an instruction cache and a data cache on the chip. Each
cache is a 64 KB, two-way, set-associative, virtually addressed cache that has
64-byte blocks. The data cache is a physically tagged, write-back cache.
Each CPU card has an 8 MB B-cache (backup cache) and a power regulator.
See Chapter 4 for instructions on installing additional CPUs.
Memory Motherboards (MMBs)
Memory options are installed into memory motherboards (MMBs) located on the
system motherboard (see Figure 1–6). There are four MMBs. The MMBs have
either four or eight slots for installing DIMMs.
See Chapter 4 for memory configuration rules and installation instructions.
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