i have a gtx560 ti soc-950Mhz version and when the card is stressed and the 3rd green led is on or the next ones it makes a strange noise like a buzz like a coil whine. Is that normal? oh and the ventilator on the left is not stable and make a noise and loses speed then gaining it back then the noise again and speed loss and so on. this happens from 50% and above fan speed. the max temperature i got was 78 degrees celsius at 82% fan speed.