You can't compare percentages - his fan at 33% is running over 500rpm faster than mine is at 40% which is going to be a big difference in noise level... at 1900+ RPM mine is around 36C idle.
well i like to run my pc quit so all fans are running on lowest speed as posible in case. its 32% i dont know why gpu-z picked it up 33% after 35% i start noticing the some more noise.
and if u would put my fans to medium in a case i bet it would run few degrees cooler