Asus Crosshair IV Formula - Manual (Page 28)

2. Northbridge/Southbridge LEDs
The northbridge and southbridge LEDs each have two different voltage
displays. The northbridge LED displays either the NB Voltage or the NB
1.8 Voltage. The southbridge LED shows either the SB Voltage, SB 1.2V
Voltage, or the HT. You can select the voltage to display in BIOS. Refer to the
illustration on the next page for the location of the northbridge/southbridge
LEDs and the table below for LED definition.
Normal (green) High (yellow) Crazy (red)
NB 1.1 Voltage 0.80000–1.58750 1.60000–1.83750 1.85000–2.00000
NB 1.8 Voltage 1.80200–1.89475 1.90800–1.94775 1.96100–3.00775
VDDPCIE 1.1V 1.11300–1.59000 1.60325–1.84175 1.85500–2.00075
SB 1.1 Voltage 1.11300–1.44250 1.45750–1.69600 1.70925–1.80200
SB HT 1.2 Voltage 0.80000–1.38750 1.40000–1.65000 1.66250–2.00000
Onboard LEDs
The motherboard comes with LEDs that indicate the voltage conditions of CPU,
memory, northbridge, and southbridge. You may adjust the voltages in BIOS. There
are also an LED for hard disk drive activity and an onboard switch for power status.
For more information about voltage adjustment, refer to 3.3 Extreme Tweaker
menu.
Normal (green) High (yellow) Crazy (red)
CPU Voltage (default) By CPU–1.3625 1.3750–1.4875 1.5000–By CPU
VDD NB By CPU–1.3625 1.3750–1.4875 1.5000–By CPU
VDDA 2.5 Voltage 2.20000–2.76250 2.77500–3.00000 3.01250–3.18750
1. CPU LED
The CPU LED has three voltage displays: CPU Voltage, VDDNB, and VDDA
Voltage; you can select the voltage to display in BIOS. Refer to the illustration
on the next page for the location of the CPU LED and the table below for LED
definition.
3. Memory LED
Refer to the illustration on the next page for the location of the memory LED
and the table below for LED definition.
Normal (green) High (yellow) Crazy (red)
DRAM Bus Voltage 1.20000–1.72500 1.73750–2.32500 2.33750–2.90000
VDDR 1.2 Voltage 1.20575–1.39125 1.40450–1.65625 1.66950–1.80200
2-2 Chapter 2: Hardware information