@ tats, I have a HAF-X with a 120mm fan blowing directly at the GPUs with the provided GPU fan shroud. I am planning to purchase the Twin Frozr II due to the "better cooling", what other GPUs do you recommend, if not just stick with the stock reference GPU?
Regardless of what cooler a card has, every 580 will produce the same amount of heat, it is just a question of what happens to that heat.
The stock design keeps the chip warmer than the TFII however it exhuasts the heat out of the case, while the TFII will keep the chip cooler but move the heat into the case.
With a high airlfow case you should be better off but just know that the benefits of a TFII may be offset by it having to use the warmer air inside the case or by grabbing the hot air off the back of the Palit.