In addition to following fan modes seen in X9 boards:
Standard, Optimal and Full Speed
X10 boards have these 2 new fan modes:
Heavy IO -- This mode is only available for X10 motherboards with dual cooling zone
designs. Select this mode to boost cooling capacity in the PCI-E add-on card area.
PUE Optimal -- This mode is only available for specific X10 single cooling motherboards.
Select this mode to achieve lowest possible cooling fan power consumption under normal
system operating conditions.