Processor; Memory; Bus Master I/O Expansion Slots; Real-Time Clock/Calendar - NEC HX4600 User Manual

Processor

Each Pentium III Xeon processor is 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 (512K, 1MB or 2MB); a thermal
plate; and a back cover. The cartridge is secured by a retention module attached
to the baseboard. Depending on configuration, your system has one to four
processors (see Figure 1-7). Additional Pentium processors enhance
performance and enable symmetric multiprocessing (SMP). All processors
access the same memory and I/O space and tasks can run on either CPU if your
operating system (OS) supports SMP.

Memory

The system supports a maximum of two memory boards. Each memory board
contains sixteen 168-pin DIMM sockets (see Figure 1-8, A and C). A minimum
system configuration includes 128 MB (using four 32 MB DIMMs) of system
memory. Sixteen DIMM sockets on each memory board allow for system
memory expansion up to 8 GB (using sixteen 256 MB DIMMs on each memory
board). 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.

Bus Master I/O Expansion Slots

The server's expansion capabilities meet the needs of high performance I/O
servers by providing a combination of PCI local bus and ISA connectors. The
system I/O board offers ten dedicated PCI slots, four of which are 64-bit, and
one combination slot that may be configured as a PCI slot or an ISA slot. The
ISA architecture supports 32-bit memory addressing and 16-bit data transfers for
the CPU, DMA, and bus masters.

Real-Time Clock/Calendar

The real-time clock provides system clock/calendar information stored in a non-
volatile memory (NVRAM) (Figure 1-6, M). The real-time clock battery (see
Figure 1-6, G) provides power backup for the real-time clock.

BIOS

A BIOS and Setup Utility are located in the Flash memory on the system I/O
board and include support for system setup and PCI/ISA Plug-and-Play auto-
configuration. A number of security, reliability, and management features are
also incorporated to meet vital server needs.
1-16 System Overview