OK guys, here's the thing. I fly big 6 foot carbon fibre model helicopters, that contain lots, and lots of bearings. It totally normal to get a slight discharge from the bearing dust seals. Irrespective of whether it runs at 8000 rpm or 40,0000 rpm, its totally normal. There has to be a slight gap between the bearing collar that spins, and the dust seal (that contains the grease/oil). The reason is to allow for thermal expansion as the bearing warms up. Don't worry about it. Its usually not a problem for electronics in my opinion. Just enjoy your cards, and if the fan fails, send it in for RMA.