CAUTION! Memory is static sensitive. Do not handle loose memory modules without grounding yourself or using an anti-static strap. Failure to do so can result in damage to the modules, and result in premature failure or intermittent problems. Most systems have power saving features and should have the power cable disconnected before installing or removing memory, CPUs, or adapter cards.

Description:
The Intel D850GB motherboard uses RAMBUS RIMM™ memory modules. Memory is installed two RIMM modules at a time. Both memory modules installed in a bank must have the same characteristics of speed and capacity. We do not recommend mixing different manufacturer modules when populating a bank of memory.

Note: There can be no empty RIMM connectors. RIMM connectors without a RIMM installed must be populated with Continuity RIMMs. The Continuity RIMMs are used to provide signal paths for the memory modules.

Intel D850GB System Board Layout
There are a total of four memory slots on the D850GB system board. Memory must be added in pairs, with the same type of RIMM module installed in both slots of Bank 0 or Bank1. Continuity RIMM modules must be installed in any empty slots. Your system will not boot up if any slot is left empty. If memory is added to both banks, all RIMM modules must be of the same speed.

RIMM Description
Memory RIMMs have a heat spreader over the chips, while Continuity RIMMs (C-RIMMs) have no chips at all. C-RIMM modules complete the channel connections for the installed memory.

• Bank 0 must be populated first, ensuring that the RIMM* memory modules installed in RIMM1 and RIMM2 are identical in speed, size, and density. For example, the minimum system configuration would use two 64-MB RIMM memory modules of PC600 or PC800 RDRAM* memory.
• If the desired memory configuration has been achieved by populating Bank 0, then Bank 1 should be filled with two continuity RIMM modules.
• If memory is to be installed in Bank 1, the RIMM memory modules installed in RIMM3 and RIMM4 must be identical in size and density to each other, and match the speed of the RIMM memory modules in Bank 0. The RIMM memory modules do not, however, need to match those in Bank 0 in size and density. For example, if Bank 0 has two 128MB RIMMs of PC800 RDRAM, Bank 1 would require PC800 RDRAM memory. However, any other supported RIMM memory modules such as 64-MB, 96-MB, 128-MB, 192-MB, or 256-MB could be used.

To install a RIMM memory module or continuity module, line up the notches with the small ribs in the exposed slot. Insert the module and press it down into the slot until the two latch mechanisms flip up and lock the module in place. You should not have to touch or adjust the clips during installation. To remove a module, push both outside clips out and down.

Configurations
The Intel® Desktop Board D850GB supports up to 2.0 GB of system memory using PC600 (300 MHz) or PC800 (400 MHz) RIMM memory modules.

*Note: PC700 RIMM memory modules are not a supported configuration with the D850GB. Some typical configurations are listed below: