I have installed the fan on the i7 920 and am very pleased volume moderate compared to boxed fan. The Alpenföhn cools the CPU to about 39 ° C at idle (where the standard fan was already at 45 ° C) and remains under load only in the lower speed range. However, if you shut off the automatic speed control and turning up the fan at 100% it is already very clear herauszuhören.Ž Installation is simple, but a bit more time-consuming than the standard fan, because the motherboard has to be dismantled. For installation in 18 cm wide case the chunk is too high.