NEC EXPRESS5800/120Re-2, Service Manual, Page: 24 / 238

1-8 System Overview
Xeon™ Processors
Depending on system configuration, each system includes one or two Intel Xeon
1.80GHz or 2.40GHz processors. Each processor plugs into a INT3/FCPGA socket
package. The processor includes a 512K cache. When two processors are installed, both
processors must be of identical bus and core speed.
The processor external interface operates at a maximum of 400MHz. 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 system board contains six 168-pin DIMM sockets. Memory is partitioned as three
banks of registered SDRAM DIMMs (DDR200 compatible) that must be populated in
pairs, each providing 72 bits of buffered two-way interleaved memory (64-bit main
memory plus ECC). Your system may include from 256 MB to 6 GB of memory, using
up to six DIMMs.
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.
PCI Riser Slots
The server's expansion capabilities meet the needs of file and application servers for
high performance I/O by providing PCI expansion slots.
The system board has three full-length, full height 64-bit/100MHz PCI-X slots (riser
slot B) and three low profile 64-bit/66MHz PCI slots (riser slot A).
Riser slot A provides the following features:
!
Bus speed up to 66 MHz
!
184 pin, 5 volt keyed, 64-bit expansion slot connector
!
Support for a 3-slot PCI riser card
!
Support for only low profile PCI cards
Riser slot B provides the following features:
!
Bus speed up to 100 MHz
!
184 pin, 5 volt keyed, 64-bit expansion slot connector
!
Support for a 3-slot PCI riser card
!
Support for only full length, full height PCI cards.