Ah thanks for the reply, I wasn't paying attention and assumed that the 780i only had a 3 pin connecter. After looking at several pictures / reviews I'm almost 100% positive it does in fact have a 4 pin. Thanks for the info though on whether or not it will fit. Still looks like its going to be a tight squeeze... Noise isn't really an issue though since everything is getting thrown into a Coolermaster Stacker 830. Whats one more fan going to do. :P
Anyway, thanks for the info!