MSI X99S GAMING 9 AC - Manual (Page 48)

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SLOW_1: Slow Mode Booting Switch
This switch is used for LN2 cooling solution, that provides the extreme overclocking
conditions, to boot at a stable processor frequency and to prevent the system from
crashing.
(Please enable this
swtich during BIOS
POST.)
Normal
(Default)
Enabled
Important
• Users will try extreme low temperature overclocking at their own risks. The
overclocking results will vary according to the CPU version.
• Please don’t switch to “Enabled” when power-off or the system will be un-bootable.