Asus RS700-E6/RS4 - Manual (Page 44)

Chapter 4: Motherboard information 4-8
8. DDR3 voltage setting (4-pin LVDDR3_SEL1/2)
These jumpers allow you to select DDR3 DIMM voltage settings. Place
the jumper caps on pins 1–2 if you want to control DDR3 voltage by BIOS
settings (default). Place the jumper caps on pins 2–3 to force the DDR3
DIMMs to run at +1.2V. Or you can place the jumper caps on pins 3–4 to
force the DDR3 DIMMs to run at +1.35V.