IBM 7985 Problem Determination And Service Manual

Removing a memory moduleTo remove a dual inline memory module (DIMM), complete the following steps.DIMMRetainingclip1. Read the safety information that begins on page vii and “Installation guidelines”on page 105.2. Turn off the server and all attached devices.3. Disconnect all external cables and power cords.4. Remove the cover (see “Removing the cover” on page 109).5. Remove the riser-card assembly (see ″Removing the riser-card assembly″ onpage 120).6. Remove the air baffle (see “Removing the air baffle” on page 111).Attention: To avoid breaking the retaining clips or damaging the DIMMconnectors, open and close the clips gently.7. Open the retaining clip on each end of the DIMM connector and lift the DIMMfrom the connector.8. Replace the DIMM or remove the second DIMM of the pair.9. If you are instructed to return the DIMM, follow all packaging instructions, anduse any packaging materials for shipping that are supplied to you.Installing a memory moduleFor information about the types of dual inline memory modules (DIMMs) that theserver supports and other information that you must consider when installingDIMMs, see the User’s Guide on the IBM System x Documentation CD.v The server comes with a minimum of two 512 MB DIMMs, installed in slots 1 and2. When you install additional DIMMs, you must install two identical DIMMS at atime, in the order shown in the following table, to maintain performance:Table 7. DIMM installation sequenceDIMMs 1 microprocessor installed 2 microprocessors installed2 DIMM connectors 1 and 2 Not applicable4 DIMM connectors 1 through 4 DIMM connectors 1 and 2 and 9 and106 DIMM connectors 1 through 6 DIMM connectors 1 through 4 and 9and 10132 IBM System x3655 Type 7985 and 7943: Problem Determination and Service Guide