Asus Z97-A/USB 3.1 - Page 47

ASUS Z97-A/USB 3.1
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4. EPU LED (OLED2)
The EPU LED lights up when the EPU switch is enabled.
3. TPU LEDs (TPU_LED)
The TPU LEDs light up when you set the TPU switch to TPU_I mode or TPU_II mode.