How much Rad for CF 6870

How much raddage do you think I will need for two overclocked 6870s in crossfire. I know they don't get too hot, however I will overclock them and the fans do get annoyingly loud.

Please, I do not want an extreme answer from a radiator enthusiast. Example being, you should always get a 6x6 120 fan radiator for your graphics cards. In other words, nothing that is overkill. Just something substantial.

Lemme see two answers.

One, go to this link, look up your GPUs from the supplied link.
http://www.overclockers.com/forums/showpost.php?p=6489396&postcount=3

Then use the DT link to decide for yourself.

Two, at a min, you'll need a 120x3. Your DT on a GPU can be pretty high.