ASROCK X99 WS Mode D'emploi page 14

2.1 Installing the CPU
1. Before you insert the 2011-3-Pin CPU into the socket, please check if the PnP cap
is on the socket, if the CPU surface is unclean, or if there are any bent pins in the
socket. Do not force to insert the CPU into the socket if above situation is found.
Otherwise, the CPU will be seriously damaged.
2. Unplug all power cables before installing the CPU.
CAUTION:
Please note that X99 platform is only compatible with the LGA 2011-3 socket, which is
incompatible with the LGA 2011 socket (for X79 platform).
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