Intel Arima LH500 - Manual (Page 18)

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4. Lower the socket locking lever in place.
5. Now, rest the motherboard into the chassis, align the four holes of the backplate with the four bolts of
the chassis.
We do not recommend you to apply thermal grease at this point of the
installation. The heatsink provided already has thermal grease on the
bottom for your convenience. Do not apply more thermal grease if it is
already present. Too much thermal grease will spill onto the CPU
circuit and damage the CPU.