Intel Desktop Board D850GB Technical Product Specification
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1.5 System Memory
CAUTION
Before installing or removing RIMM modules, remove AC power by unplugging the power cord
from the computer. Failure to do so could damage the memory and the D850GB board. (After
removing AC power the standby power indicator LED should not be lit. See Figure 7 on page 40
for the location of the standby power indicator LED.)
CAUTION
The board supports combinations of no more than 32 RDRAM components per RDRAM channel.
If the total number of RDRAM components installed in all RIMM sockets exceeds 64, the computer
will not boot.
1.5.1 Memory Features
The 82850 Memory Controller Hub integrates two lock-stepped Direct Rambus channels,
providing a processor-to-memory bandwidth up to 3.2 GB/sec. The D850GB board has four
RIMM sockets (two sockets for each channel) and supports the following memory features:
• Single- or double-sided RIMM configurations
• Maximum of 32 Direct Rambus devices per channel
• Memory configurations from 128 MB (minimum) to 2 GB (maximum) utilizing 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
1.5.2 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 channel if memory is not installed.
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