Does anyone know if 5770 use a 4 pin(pwr) fan contact? or a 3 pin?

Hi Hopefully someone can help me with a small decision. I have a p182 and now I have order some new stuff to upgrade my system with, I have only one thing left to decide and that is what scysths fans to get (flex or slipstream). My set up will be the following, in the bottom compartment a corsair tx...