Replace DIMM Memory Cards
The 4U90 twin server chassis has eight 32GB RDIMM memory cards per compute node, for a total of 16 cards per twin server chassis.
DIMM Memory Card
Compute Node Modules in 4U90 Twin Server Chassis
Caution:
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Electrostatic Discharge (ESD) can damage electronic components including memory cards. To avoid damaging DIMM cards, it is important to handle them carefully. The following measures are generally sufficient.
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Use a grounded wrist strap designed to prevent static discharge.
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Handle the memory module by its edges only.
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Put the memory modules into the antistatic bags when not in use.
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Exercise extreme caution when installing or removing memory modules to prevent damage to the DIMMs or slots.
Remove DIMM Memory Card

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Hold down the power button of the compute module to be removed for at least 4 seconds.
Item | Name |
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1 | Top Compute Node Power Button |
2 | Bottom Compute Node Power Button |

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Disconnect all power supply cords and all network and system cables from the compute module.
Note: Before disconnecting cables, document the cable configuration. The cabling must be reconnected to the module in the exact same configuration.
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Unlock the left and right latches on the side of the compute module.
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Remove the compute module from the chassis and place on a flat surface.

To access the DIMM memory slots in the compute module, you will need to remove the mezzanine (node) module from the compute module.
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Unscrew the four screw thumbs on top of the module.
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Lift the left and right latches to the unlock position.
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Vertically lift the module out of the chassis. You will now have access to the memory slots in the compute module.
Item Name 1 Memory Slots

Caution: Exercise extreme caution when removing memory card to prevent damage to the DIMMs or slots.
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To remove a DIMM, push the release tabs outwards on both ends of the DIMM slot to unlock it. Remove the DIMM memory module.
Replace DIMM Memory Card

Caution: Exercise extreme caution when installing memory card to prevent damage to the DIMMs or slots.
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Align the key of the DIMM card with the receptive point on the memory slot and with your thumbs on both ends of the module, press it straight down into the slot until the module snaps into place.
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Press the release tabs to the locked position to secure the DIMM module into the slot

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Make sure the left and right latches are in the unlocked position. Align the mezzanine module vertically and lower into the compute module.
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Rotate the left and right latches forward to the lock positions.
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Carefully push down the middle section of the module to ensure connectors are fully engaged.
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Fasten the 4 blue thumb screws on top of the module.

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Carefully slide the compute module back into the chassis.
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Lock the left and right latches on the side of the compute module.
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Reconnect the power cable to the power supply and all network and system cables to the compute node.

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Press the node power button once. The compute node control board will initiate the power up sequence.
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Wait a few minutes for the node to power up and spin up all disks.
Item | Name |
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1 | Top Compute Node Power Button |
2 | Bottom Compute Node Power Button |