314 IBM eX5 Implementation GuideFigure 7-11 shows the back of the x3690 X5 with the MAX5 attached.Figure 7-11 Lab photo of an x3690 X5 (top) attached to an eX5 MAX5 (bottom)7.4.4 Accessing the DIMMs in the MAX5To access the memory DIMMs in the MAX5, slide the memory board of the MAX5 forward outthe chassis of the MAX5. Use the following steps to access the DIMMs:1. Remove ac power from all of the server’s power supplies and from the two MAX5 powersupplies. Because the QPI cables are already held in alignment by the memory expansionchassis, it is not a requirement to remove the QPI cables before removing the memoryboard.2. Remove the front bezel of the MAX5 by pressing in on the tab buttons on both sides of thebezel. The bezel then can be pulled away from the MAX5.3. As shown in Figure 7-12 on page 315, there are two blue release tabs at the front of theMAX5. When pressed to the sides of the enclosure, they allow you to pull out the camlevers that are used to begin to pull out the memory tray.Updating FPGA firmware: When attaching the MAX5 for the first time, you must reapplythe FPGA firmware using the IMM firmware update tool after the server is plugged into acpower but prior to powering up the server.Do not use Bootable Media Creator or USXPI to update the FPGA until the FPGA firmwareis a match between the server and the MAX5. Mismatched FPGA will make the serverunstable and it might power off during the flash, corrupting the FPGA. This situation willresult in requiring a hardware replacement, because there is no recovery for corruptFPGA.Important: With the server or MAX5 plugged into ac power and the scaled unit’s powerturned off, the QPI cables still have active dc power running through them. You must onlyplug in or unplug the QPI cable when the MAX5 and the server are not plugged into acpower. Failure to follow this rule will result in damaged circuits on either the MAX5 memoryboard or the system board of the server.
