48 Sun Fire V890 Server Owner’s Guide • May 2004
About CPU/Memory Boards
The system motherboard provides slots for up to four CPU/Memory boards. Each
CPU/Memory board incorporates two UltraSPARC IV chip multithreading (CMP)
processors, with 16 Mbytes of static random access memory (SRAM) Level 2 external
cache memory per processor, and slots for 16 memory modules. The external cache
memory cannot be upgraded.
Note – You must use CPU/Memory boards of the same speed within a Sun Fire
V890 system. CPU/Memory boards with UltraSPARC IV processors operate at a
speed of 1200 MHz.
Chip multithreading technology allows two threads per UltraSPARC IV processor.
With this dual-threaded architecture, each UltraSPARC IV processor consists of two
virtual processors with shared memory. A dynamic arbitration scheme enables each
thread to make optimal use of the available memory, resulting in higher
performance.
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