Ok an update. The GT 1850s arrived this morning and have been put on the H60 exhausting out the rear of the case (the air in the case is cool so intake isn't much better). I placed the single Akasa apache black which was exhausting by pulling air through the radiator onto the side panel blowing generally over the side of the RAD, cpu & RAM. Now running Prime 95 with a 5Ghz clock @ 1.384v and hasn't gone over 70C so far, will see how well it does after an hour or so.