I built this comp, from scratch. It is a Cooler master frame with three nice big fans built in to it. I have a good 850 watt power supply, and an Asus mother board n5p58pro if you need to know. Anyway when I first got it together I didn't see any lights on the fans so it didn't matter then one day I saw a red glow in my computer and when I opened it up to see what it was I saw all the fans had a very hot in them. It was cool.