Asus KCMA-D8 - Manual (Page 47)

ASUS KCMA-D8 2-29
4. DDR3 voltage control setting (4-pin LVDDR3_SEL1; LVDDR3_SEL2)
These jumpers allow you to adjust the DIMM voltage. Set to pins 1–2 to
select 1.5V BIOS control, pins 2–3 to select 1.2V Force or 3–4 to select 1.35V
Force.
5. PIKE slot setting (3-pin PIKE_SW1)
The slot 2 and PIKE slot share the x4 link. Place the jumper cap on pins 1–2
to let the system swtich the assignment automatically depending on which
slot is occupied. Or you can place the jumper cap on pins 2–3 to assign the
x4 link to the PIKE slot.