Specifications

System Overview 1-11
CPU Card
The system can have up to four CPU cards. The CPU cards are installed on the
system board. Each CPU card contains a 21264 microprocessor, the third-
generation implementation of the Alpha architecture.
The 21264 microprocessor is a superscalar CPU with out-of-order execution and
speculative 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 a 4 MB secondary B-cache (backup cache) consisting of late-
write synchronous static RAMs (SRAMs) that provide low latency and high
bandwidth. Each CPU card also has a 5 ->2 volt power regulator that supplies
up to 100 watts at 2.2 volts to the CPU.
See Chapter 5 for instructions on installing additional CPUs.
Memory Motherboards (MMBs)
Memory is installed into memory motherboards (MMBs) located on the system
board. There are four MMBs. The MMBs have either four or eight slots for
installing DIMMs. The system memory uses JEDEC standard 200-pin
synchronous DIMMs.
See Chapter 5 for memory configuration rules and installation instructions.