Asus Rampage III Black Edition - Manual (Page 64)

2. LN2 Mode Jumper (3-pin LN2)
With LN2 mode activated, the ROG motherboard is optimized to remedy the
cold-boot bug during POST at an extremely low temperature and help the
system boot successfully.
3. QPI_LL_SW Jumper (3-pin QPI_LL_SW)
This jumper prevents QPI voltage from dropping too much when you perform
overclocking. The low QPI voltage may cause system malfunction. Set
the jumper to pin 2—3 to activate this function and pin 1—2 to disable this
function.
2-32 Chapter 2: Hardware information