it is a buzzing. it has gotten better but i don't like it and will be contacting msi tomorrow. some believe it is some sort of circular resistor(i've forgotten the name). but a lot of people are having this problem and it isn't just msi cards: http://www.silentpcreview.com/forums/viewtopic.php?t=37899&highlight=8800
as far as my PSU, it's an enermax noisetaker 485w. a couple of years old. dual rails; 18a to each for a total of 36amps; from what iv'e read, that is plenty. i ran everything i have now(q6600, 4bg ddr2 800, 2 x 7200rpm HDDs, etc) except with an 8600gts in place of the 8800gt oc with it with no problems. although i'm thinking that i will probably replace that too now anyway.