Sun Microsystems Fire V890 Service Manual page 248

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The UltraSPARC IV processor is a high-performance, highly integrated, CMP
processor that enables an increase in application throughput while maintaining
binary compatibility. The UltraSPARC IV processor implements a 64-bit SPARC
International Version 9 Instruction Set Architecture (ISA).
The UltraSPARC IV processor improves throughtput performance in commerical
applications such as databases, web servers, and high performance technical
computing. It supports both 2D and 3D graphics, as well as image processing, video
compression and decompression, and video effects through the sophisticated Visual
Instruction Set (VIS™) extension. VIS provides high levels of multimedia
performance, including real-time video compression and decompression and two
streams of MPEG-2 decompression at full broadcast quality with no additional
hardware support.
The Sun Fire V890 server employs a shared-memory multiprocessor architecture
with all processors sharing the same physical address space. The system processors,
main memory, and I/O subsystem communicate via a high-speed system
interconnect bus, operating at a clock rate of 150 MHz. In a system configured with
multiple CPU/Memory boards, all main memory is accessible from any processor
over the system bus. The main memory is shared logically by all processors and I/O
devices in the system.
For information about memory modules and memory configuration guidelines, see
"About Memory Modules" on page 221.
Caution – CPU/Memory boards must be installed only by qualified service
personnel. After installing a CPU/Memory board, you must perform a
reconfiguration boot in order for the operating system to recognize the new device.
See "How to Initiate a Reconfiguration Boot" on page 10.
Caution – Either a CPU/Memory board or an air baffle must be installed in each
CPU/Memory slot at all times. After removing a CPU/Memory board, you must
install a replacement board or an air baffle immediately to avoid an automatic
thermal shutdown. For more information, see "How to Install a CPU/Memory
Board" on page 34.
220 Sun Fire V890 Server Service Manual • October 2005