TYAN THUNDER K8HR Manual page 29

Memory Installation Procedure
When you install the memory modules, make sure the module aligns
properly with the memory slot. The modules are keyed to ensure that it is
inserted only one way. The method of installing memory modules are
detailed by the following diagrams.
Once the memory modules are firmly seated in the slot, two latches on
either side will close and secure the module into the slot. Sometimes you
may need to close the latches yourself.
To remove the memory module, simply push the latches outwards until the
memory module pops up. Then remove the module.
YOU MUST ALWAYS unplug the power connector from the
motherboard before performing system hardware changes.
NOTE
Otherwise you may damage the board and/or expansion
device.
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