Sapphire Radeon HD 7970 loud fans

Hi.
I've recently bought Sapphire Radeon HD 7970 GHz Edition 3GB with Vapor-X and I have 2 problems with it.
First is coil whine (well, i suppose it's coil whine) - is it bad? I've sent one card on RMA because of it but second card (exactly the same Radeon) has that issue too. I've read that a lot of people is having this problem.
Second is the fans noise. I think that they are too "aggresive". When they're running 50% or less it's okay, they are not so loud. But when running some games they're going to make a big noise. For example - GTA 4 - I'm playing normally but during the cutscenes the temperature is rising to 75C degrees and fans are really loud. Or playing World of Warcraft - sometimes it's quiet but sometimes they're loud. I don't know why is it happening.

Is it a defect? RMA it again? Or that Radeon is just loud?



PS If i made any mistakes - I'm sorry but english is not my primary language and i'm still learning