I just received my Spectre Pro 200mm and i have the grinding / clicking noise too
It's doing it on and off which is really annoying. If you push the center of the fan it stops for a few seconds then starts again. Tried with my Bitfenix Recon controller and with the molex adapter it came with 
It's doing it on and off which is really annoying. If you push the center of the fan it stops for a few seconds then starts again. Tried with my Bitfenix Recon controller and with the molex adapter it came with 











