Asus Z8PH-D12/IFB - Manual (Page 40)

2-22 Chapter 2: Hardware information
2. VGA controller setting (3-pin VGA_SW1)
This jumper allows you to enable or disable the onboard VGA controller. Set
to pins 1–2 to activate the VGA feature.
3. 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.