I have a desk fan lying on top face down on top of my box right over the power supply. Sounds stupid, but my case is so jammed, I really need a server type case. The fan on top face down really works, otherwise I'd be sweating bullets around my PC. The box is packed with fans & I have to clean the fans once a month, due to cats. My cats love to sleep next to the PC since, it's so warm ~eye roll~ I have a 450W supply, I can't remember the brand name the techie put in, but it has green neon all over it that glows thru the case holes. I can turn all the lights off & still find my way LOL.