NEC Express5800/140Hb, Service Manual

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1-16 System Overview
System Board Set Features
The following subsections provide a description of the system board set features.
Pentium III Xeon Processor
Depending on system configuration, each system includes one to four Pentium III Xeon
processors. Each Pentium III Xeon processor is packaged in a Single Edge Contact
Cartridge (S.E.C.). The cartridge includes the processor core with an integrated 16 KB
primary (L1) cache, a secondary (L2) cache (1MB or 2MB), thermal plate, and a cover.
The processor implements the MMX
™
technology and the processor’s numeric
coprocessor significantly increases the speed of floating-point operations.
The processor external interface operates at a maximum of 100 MHz. The second-level
cache is located on the substrate of the processor cartridge. The cache includes burst
pipelined synchronous static RAM (BSRAM).
System Memory
The memory board contains sixteen 168-pin DIMM sockets. Memory is partitioned as
four groups of registered SDRAM DIMMs (PC100 compatible), each providing 72 bits
of 4 way interleaved memory (64-bit main memory plus ECC). Your system may
include from 64 MB to 16 GB of memory, using up to sixteen DIMMs. ECC
generation/checking is provided for detection and correction of memory errors.
Note:
Only use DIMMs approved for use in this server system.
Call your customer service representative for information.
I/O Expansion Slots
The server's expansion capabilities meet the needs of file and application servers for
high performance I/O by providing a combination of 32-bit and 64-bit PCI expansion
slots.
The system board has two full-length 32-bit, 33 MHz PCI connector slots (see A in
Figure 1-9), two full-length 64-bit, 66 MHz PCI connector slots and four 64-bit 33MHz
PCI connector slots (see B in Figure 1-9.
PCI features:
!
Bus speed up to 66 MHz (PCI#3 and PCI#4)
!
Bus speed up to 33 MHz (two 32-bit and four 64-bit PCI slots)
!
32-bit memory addressing
!
Burst transfers up to a peak of 132 MB/s (32 bit, 33 MHz PCI) and 264 MB/s
(64 bit, 33 MHz PCI) and 528 MB/s (64 bit, 66 MHz PCI)
!
8-, 16-, 32-, or 64-bit data transfers
!
Plug and Play ready
!
Parity enabled.