Lenovo 6447, 6446, 6445, 6444 manual Installing a memory module

2.If you are planning to install or remove a microprocessor, memory module, PCI adapter, battery, or other non-hot-swap optional device, turn off the server and all attached devices and disconnect all external cables and power cords (see “Turningoff the server” on page 39).

Attention: In a dc power environment, only trained service personnel other than Lenovo service technicians are authorized to connect or disconnect power to the dc power supply. See the documentation that comes with each dc power supply.

3.Press down on the left and right side latches and pull the server out of the rack enclosure until both slide rails lock.

Note: You can reach the cables on the back of the server when the server is in the locked position.

4.Lift the cover-release latch
1. Lift the cover off the server and set the cover aside.

Attention: For proper cooling and airflow, replace the cover before you turn on the server. Operating the server for extended periods of time (more than 30 minutes) with the cover removed might damage server components.

Installing a memory module

The following notes describe the types of dual inline memory modules (DIMMs) that the server supports and other information that you must consider when installing DIMMs:

vThe server supports up to 12 Fully Buffered DIMM PC2-5300 512 MB, 1 GB, 2 GB, and 4 GB DIMMs, for a maximum of 48 GB of system memory. See http://www.lenovo.com/accessories for a list of memory modules that you can use with the server.

Note: Because some memory is reserved for system operation, the actual usable memory size that is reported by the operating system is less than the total installed size.

vThe server comes with a minimum of two 512 MB DIMMs, installed in slots 1 and 4. When you install additional DIMMs, you must install two identical DIMMS at a time, in the order shown in the following table, to maintain performance.

10ThinkServer RD120 Types 6444, 6445, 6446, and 6447: Installation Guide