I think the fan works as advertised but even at high speed I think their exhaust flow is greater without the fan installed, they obscure the original fan outlets and I think this is worse overall make. Also, since I have an external hard drive and wireless headset, I needed more available USB jacks on the front, and the adapter you get does a terrible job of providing enough power to even use it. My headset only works when I use a USB 3.0 and when I use the left one it really sucks. The top 3 USB are completely useless and I can't even get enough power to run the exhaust fan. I need to use the rear USB on the PS4 Pro for an external hard drive and because the adapter is so crappy I don't even use it because it only gives me 1 USB that actually works adequately so save your money and do it don't buy any in my head