If your talking about the 5 LEDs to the top right of the RAM (straight row up and down):
Page 25 of UD5 rev1.0 Manual - "The onboard CPU overclock LEDs indicate on which level the CPU is overclocked. The higher the overclock level, the more the number of lighted LEDs. Off: Normal Condition / F_LED1~F_LED5 : Blue"
If your asking about the 5 LEDs to the top left of the RAM (3 and then 2 LEDs side by side)
"Temperature indicator LEDs - ... The LEDs are off when the temperature is below 60C; the green LED lights up when the temperature is between 61-80C; the red LED is illuminated when the temperature exceeds 80C"
There are also LEDs for NB temps beside the NB.
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