NEC Express5800 Series User Manual page 33

Precautions for Use 1-13
Make sure that the optional devices are attachable and connectable to the equipment. There is
a risk of malfunctions that could lead to a breakdown of the equipment even if you could
attach and connect.
Make sure that your options are compatible with the system. If you attach any incompatible
option, there is a risk of malfunction that could lead to a breakdown.
It is recommended to use NEC's genuine option products. Some competitors' products are
compatible with this server. However, servicing for trouble or damage resulting from such a
product will be charged even within the warranty period.