Their projected life time at 50c is some 20 odd years
show me this info, a cap is expected to run at below 30c for over 80% of its life. it not expected to pinned to the wall every day of its life. so based on that id like to know where you pull your info from of if you just out there preding crap about for fun?
"Supreme 12K black capacitors with lifespans of
at least 12,000 hours [emphasis added]. Compared to other counterparts on high-end motherboards that merely have lifespans of around 10,000 hours, ASRock applied Nichicon 12K Black Caps that offer 20% longer lifespans and provide more stability and reliability."
12,000 Hours = 500 Days = 1.37 Years (total power on time) - This is based on it spending 80% of its life below 30C, so again where did you get 20 years from at 50c.
lifeactual = lifebase × temperatureFactor × voltageFactor × currentFactor
lifeactual is the life expectancy at the operating temperature, voltage, and current.
lifebase is the life expectancy at the rated temperature, voltage, and current temperatureFactor : For both Al e-caps and film capacitors, a 10oC decrease in temperature results in a doubling of life expectancy. So the temperature factor is 2**(0.1*(Tm−Tc)) . Where
Tm is the rated temp and
Tc is the operating temp.
voltageFactor is the derating due to the operating voltage being lower than the maximum rated voltage. According to United Chemi-Con, voltage has far less of an effect than temperature on the lifespan of an Al e-cap (unless the voltage is exceeding the rated maximum)
currentFactor is the derating due to the operating current being lower than the maximum rated current. Current has a more significant effect on Al e-caps than film capacitors because of their higher equivalent series resistance (ESR). The power loss due to the ESR will be equal to I2capRESR and all of this power loss leads to self heating which will affect lifespan.
