sigma1061

Hey folks, long time Thermaltake PSU owner here and I have a spanking new Toughpower 850W installed and it makes a significant amount of what I believe is fan noise. It works just fine, but even under no load (no video card, just booting to Windows) it makes a rather loud, deep, continuous clicking sound. If it were high pitched I would think the fan was maybe hitting the guard. Is this normal with higher wattage PSUs? I'd hate to RMA a brand new PSU. Thanks!