S!
A good ventilated case is top priority with any brand GPU/CPU system to keep temps at bay. Also placing the case in a place where the in and outgoing airflow is not obstructed helps a lot. Sure anyone can say brand N or A is hotter/louder than the other, but most of times it is the case causing most problems being too small, crammed, dusty or whatever.
I run AMD 6970HD 2Gb and it idles at 36'C, after a long session of gaming around 70'C and still the fan is not any louder than my case coolers or CPU cooler. nVidia has good cooling solutions as well so they are pretty decent in noise department as well.
And finally I would not judge AMD or nVidia only by Cliffs Of Dover. I can say that CoD is the crappiest running game on my rig(see sig) bar none. I play World Of Tanks, EVE Online, Warhammer 40k: Space Marine, Deus Ex Human Revolution etc. without problems in performance or image quality. I would make a GPU comparison on CoD after Luthier & Team have patched this game to be what it should be and not a beta as it is now.
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