User Guide

Hardware Installation
2-21
2.4 Configuring the System Memory
Pin 1 of
DIMM2
Pin 1 of
Bank1
Pin 1 of
Bank0
Pin 1 of
DIMM1
This mainboard has four 72 pin SIMM
sockets (Single-in-line Memory
Module) and two 168 pin DIMM socket
(Dual-in-line Memory Module) that
allow you to install system memory
from minimum 8MB up to maximum
256MB.
The SIMM supported by this mainboard can be identified by 4 kinds of factors:
♦ Size: single side, 1Mx32 (4MB), 4Mx32 (16MB), 16Mx32 (64MB), and double
side, 1Mx32x2 (8MB), 4Mx32x2 (32MB), 16Mx32x2 (128MB).
♦ Speed: 60ns or 70ns access time
♦ Type: FPM (Fast page mode) or EDO (Extended data output)
♦ Parity: without parity (32 bit wide) or with parity (36 bit wide).
The DIMM supported by this mainboard are always 64-bit wide SDRAM.
♦ Size: single side, 1Mx64 (8MB), 2Mx64 (16MB), 4Mx64 (32MB), 8Mx64
(64MB), 16Mx64 (128MB), and double side, 1Mx64x2 (16MB), 2Mx64x2
(32MB), 4Mx64x2 (64MB), 8Mx64x2 (128MB), 16Mx64x2 (256MB).
♦ Speed: normally marked -67, which means synchronous to maximum 67MHz.
♦ Parity: without parity (32 bit wide)
Because Pentium and Pentium Pro processor has 64 bit bus width, the four SIMM
sockets are arranged in two banks of two sockets each, they are Bank0 and Bank1.
Both SIMMs in each bank must be in the same size and type. It is allowed to have
different speed and type in different bank, for example, 70ns FPM in one bank and
60ns EDO in another bank, in such case, each bank is independently optimized for
maximum performance. The memory timing requires at least 70ns fast page mode
DRAM chip, but for optimum performance, 60ns EDO DRAM is recommended.