i'm looking to buy a 80mm to put on the back of expansion slots to pull the air out from there . WHat is the best 80mm fan ? is the vantec tornado ? how loud is it ? also looking at Antec Pro 80mm case fan with 34 CFM , will that be enuf . currently have a intel socket 478 heatsink fan put on there, doing a good job by reducing the temp of gpu and HDD by 4C , but makes a high pitched nosie .