MSI Z87M GAMING - Manual (Page 47)

Chapter 1
1-33 Getting Started
JSLOW1: Slow Mode Booting Jumper
This jumper 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.
Normal
(Default)
1
Enabled
1
Important
Users will try extreme low temperature overclocking at their own risks. The
overclocking results will vary according to the CPU version.