It's not necessary to have three fans - I'm just running mine with one top fan to see how it goes, and everything is running fine at the moment.
Another question.The Corsair PSU is the HX version,does that have the 8- and 6-pin connector that's needed for the 5970?
Where have you put it?In wich of the 3 holes?
I noticed that those Noiseblockers are 1200 Tpm?And 20 Dba.Isn't that a tad too much for this case,as in:i want as silent as possible?