RAC341 User Manual

Hardware Installation

Important:

Electrostatic discharge (ESD) can damage your system board, processor, disk drives, add-in boards, and other components. Perform the upgrade instruction procedures described at an ESD workstation only. If such a station is not available, you can provide some ESD protection by wearing an antistatic wrist strap and attaching it to a metal part of the system chassis. If a wrist strap is unavailable, establish and maintain contact with the system chassis throughout any procedures requiring ESD protection.

System Memory

Important:

When the Standby Power LED lit red, it indicates that there is power on the system board. Power-off the PC then unplug the power cord prior to installing any devices. Failure to do so will cause severe damage to the motherboard and components.

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Standby

Power LED

Channel A

Channel B

DDR3-1

DDR3-2

DDR3-3

DDR3-4

Features

• The four DIMM sockets are divided into 2 channels:

Channel A - DDR3_1 and DDR3_2

Channel B - DDR3_3 and DDR3_4

• Dual channel memory interface

• Maximum of 32GB system memory

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Hardware Installation

The system board supports the following memory interface.

Single Channel (SC)

Data will be accessed in chunks of 64 bits (8B) from the memory channels.

Dual Channel (DC)

Data will be accessed in chunks of 128 bits from the memory channels. Dual channel provides better system performance because it doubles the data transfer rate.

Single Channel

Dual Channel

DIMMs are on the same channel.

DIMMs in a channel can be identical or completely different. However, we highly recommend using identical DIMMs.

Not all slots need to be populated.

DIMMs of the same memory confi guration are on different channels.

Important:

1. You can populate either Channel A or Channel B fi rst.

2. When installing a DIMM in Channel A or Channel B, always populate the socket that is farthest the CPU. In this case, it will mean populating DDR3-2 and/or DDR3-4 fi rst.

3. If you intend to use dual channel, the same rule applies - always the socket farthest the CPU. Populate DDR3-2 and/or DDR3-4 fi rst; not DDR3-2 and DDR3-3 and not DDR3-1 and DDR3-4.

Hardware Installation

Installing the DIM Module

Note:

The system board used in the following illustrations may not resemble the actual board. These illustrations are for reference only.

1. Make sure the PC and all other peripheral devices connected to it has been powered down.

2. Disconnect all power cords and cables.

3. Locate the DIMM socket on the system board.

4. Push the “ejector tabs” which are at the ends of the socket to the side.

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Ejector tab

Ejector tab

5. Note how the module is keyed to the socket.

Key

Notch

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Hardware Installation

6. Grasping the module by its edges, position the module above the socket with the “notch” in the module aligned with the “key” on the socket. The keying mechanism ensures the module can be plugged into the socket in only one way.

7. Seat the module vertically, pressing it down fi rmly until it is completely seated in the socket.

8. The ejector tabs at the ends of the socket will automatically snap into the locked position to hold the module in place.