System Memory; Memory Features; Continuity Rimm Modules - Intel D850MVSE Specification

1.7 System Memory

CAUTION
Turn off the power and unplug the power cord before installing or removing RIMM modules.
Failure to do so could damage the memory and the board. (After AC power is removed, the
standby power indicator LED should not be lit. See Figure 11 on page 45 for the location of the
standby power indicator LED.)
NOTE
The board supports combinations of no more than 32 RDRAM components per RDRAM bank. If
the total number of RDRAM components installed in all RIMM sockets exceeds 64, the computer
will not boot.

1.7.1 Memory Features

The 82850 MCH integrates two lock-stepped Direct Rambus banks, providing a processor-to-
memory bandwidth up to 3.2 GB/sec. The D850MD and D850MV boards have four RIMM
sockets (two sockets for each bank) and support the following memory features:
Single- or double-sided RIMM configurations
Maximum of 32 Direct Rambus devices per bank
Memory configurations from 128 MB (minimum) to 2 GB (maximum), using 128 Mbit or
256 Mbit technology PC600- or PC800-compliant RDRAM
Serial Presence Detect (SPD)–based configuration for optimal memory operation
Suspend to RAM support
ECC and non-ECC support
NOTE
PC700 memory can be installed on D850MD and D850MV boards but defaults to PC600-level
performance.

1.7.2 Continuity RIMM Modules

All RIMM sockets must be populated to achieve continuity for termination at the Rambus
interface. Continuity RIMMs (or "pass-through" modules) must be installed in the second
RDRAM bank if memory is not installed. If any of the RIMM sockets are not populated, the
computer will not complete the Power-On Self-Test (POST) and the BIOS beep codes will not be
heard.
Product Description
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