NEC MH4500 - Manual (Page 15)

System Overview 1-7
Pentium II Xeon Processor
The system board supports up to four Pentium II Xeon processors, each
packaged in a Single Edge Contact (S.E.C.) cartridge. The cartridge includes the
processor core with an integrated 16 KB primary (L1) cache; the secondary (L2)
cache; a thermal plate; and a back 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 100 MHz. The second-level cache is
located on the substrate of the S.E.C. cartridge. The cache includes burst
pipelined synchronous static RAM (BSRAM). The L2 cache is offered in 512
KB and 1 MB configurations, with error correcting code (ECC) that operates at
half the core clock rate.
The processors are supported by one or more voltage regulator modules (VRM)
on the system board, with the number of VRMs dependent on the number of
processors installed.
Each S.E.C cartridge connects to the system board through a 330-pin Slot 2
edge connector. The Slot 2 connectors are arranged in a vertical stack of four on
the system board. The VRM modules are located adjacent to the processors.
System Memory
System memory is mounted on a memory module that connects to the system
board. The module contains sixteen 168-pin DIMM sockets arranged in four
banks. Up to 4 GB of EDO DIMM memory is supported, with 32 MB being the
minimum (the system ships with a minimum of 128 MB). The memory module
supports a 64/72 bit four-way-interleaved pathway to main memory on the
module and supports 4:1 interleaving.
System memory begins at address 0 and is continuous (flat addressing) up to the
maximum amount of DRAM installed (exception: system memory is
noncontiguous in the ranges defined as memory holes using configuration
registers). The system supports both base (conventional) and extended memory.
The system BIOS automatically detects, sizes, and initializes the memory array,
depending on the type, size, and speed of the installed DIMMs. The BIOS
reports memory size and allocation to the system via configuration registers.
The memory module connects to the system board through a 242-pin connector.
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 PCI local bus and ISA
connectors.
The system board has one full-length ISA bus connector. The connector shares a
chassis expansion slot with a PCI connector and supports half-length ISA
boards.