Sdram; Memory Configurations - NEC POWERMATE PROFESSIONAL 9000 Service Manual

1-18 Technical Information
The memory configuration consists of four sockets. The DIMM memory sockets accept
168-pin, 64-bit (non-parity) 16-, 32-, 64-, and 128-MB SDRAM DIMMs (64-MB and
128-MB as available) and 256-MB EDO DIMMs (as available). Table 1-5 lists the
supported DIMMs.
DIMM Size
16 MB
32 MB
64 MB
128 MB
256 MB
Memory can be installed in one, two, three, or four sockets. Memory type, size, and speed
can vary between sockets, so EDO and SDRAM DIMMs can be installed on the same
system board.
Memory upgrades are easy with DIMM modules. Advantages of using DIMMs include:
T
DIMMs do not need to be installed in pairs on the system board.
T
DIMMs of different memory types and sizes can be installed on the same board.
T
No switches or jumpers need to be set if the memory is changed.
T
System BIOS automatically detects the DIMMs.
See "DIMM Upgrade" in Section 3 for DIMM installation procedures.

SDRAM

Synchronous DRAM (SDRAM) improves memory performance through memory access
that is synchronous with the memory clock. This simplifies the timing design and increases
memory speed because all timing is dependent on the number of memory clock cycles.
Table 1-5 Memory Configurations
Type
CAS Latency 2 SDRAM
CAS Latency 2 SDRAM
CAS Latency 2 SDRAM
CAS Latency 2 SDRAM
EDO DRAM only
NOTE: To function properly, SDRAM DIMMs
used on the system board must meet the Intel
4-clock, 66 MHz, unbuffered SDRAM
specification (version 1.0) and support CAS
Latency 2 for 64- or 72-bit SDRAM.
Configuration Technology
2-Mbit x 64-bit 16 Mbit
4-Mbit x 64-bit 16 Mbit
8-Mbit x 64-bit 64 Mbit
16-Mbit x 64-bit 64 Mbit
32 Mbit x 72/64 64 Mbit