Seem to be having a strange problem. I have 2 Thermaltake Riing 14 Red LED case fans hooked up, both using the LNC. One fan spins at ~1000 rpm as expected with the LNC. However, the the second fan spins at ~850 rpm with the LNC. Why would the second fan be spinning slower? Fans are connected to 4-pin chassis fan headers on my AsRock Killer SLI AM4 motherboard.