VERY INTERESTING
the stock cooler is far better at cooling the RAM and the board than the Arctic, but the Arctic keeps the processor at a much lower temp..
when you stop gaming you cant touch the board with the Arctic on, it almost burns your finger, but the stock cooler is miles better, a lot cooler.
the Titan X cooler is actually really good, the processor looses its heat in about 10 seconds, it's taking a long time to get used to this card but i'd say it's pretty damned good.
so which is best ? ......... the stock cooler wins, because it keeps the board far cooler, which is very strange because the Arctic backplate is huge.