Onboard LEDs
The motherboard comes with LEDs that indicate the voltage conditions of CPU,
memory, and PCH. 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.
1. CPU LED
The CPU LED has three voltage displays: CPU Voltage, CPU PLL, and IMC
2. Memory LED
Refer to the illustration below for the location of the memory LED and the
3. PCH LED
The PCH LED shows the PCH Voltage. Refer to the illustration below for the
Normal (green) High (yellow) Crazy (red)
CPU Voltage (default) 0.85–1.4 1.40625–1.54375 1.55–
CPU PLL
1.60325–2.00075
(79h–97h)
2.014–2.10675
(98h–9Fh)
2.12–
(A0h–)
IMC
1.007–1.3515
(4Ch–66h)
1.36475–1.60325
(67h–79h)
1.6165–
(7Ah–)
Normal (green) High (yellow) Crazy (red)
DRAM Bus Voltage
1.3515–1.60325
(66h–79h)
1.6165–1.78875
(7Ah–87h)
1.80200–
(88h–)
Normal (green) High (yellow) Crazy (red)
PCH Voltage
1.007–1.15275
(4Ch–57h)
1.166–1.20575
(58h–5Bh)
1.219–
(5Ch–)
2-2 Chapter 2: Hardware information
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