NEC Express 5800 User Manual page 286

Hardware
(Note 1) The parameter cannot be set to other than "Type1" when "x2APIC" parameter in CPU
Configuration menu is set to "Disabled" In this case, it is not necessary to change
the parameter according to the OS.
Type2
Type3
286
parameter needs to be set
according to the OS.
Please see "Appendix C.
Settings for each OS" for
details.
[ ]: Factory default