However, it's not noticeable if you use headphones to game.
Buying new.
R290/290X are designed to operate at 100% until a certain temp is reached, then they throttle until they reach a target safe temp, then they will ramp up again, throttle again, etc. With a moderately warm room and a less than perfect case, you can get quite a lot of throttling and noise.
That's not how it works. It reaches a temperature, and stays there. It won't run the fan faster than it needs to. It won't cool itself down.
And it retargets so fast monitoring software may not even catch clocks dipping and coming up again.
So even if you think it's not throttling-- it might still be throttling. Microthrottling.
Oh, I've watched both the clock frequencies throttle up and down using both AMD's Catalyst drivers and GPU-Z. Set the target GPU temperature at 75-85C, allow the fan to hit 100%, and you'll see the drivers drop the core clock down 30-40% to try hit it. Thats not microthrottling, you can see it plain as day.
Very loud. Obnoxious, even.
I got rid of it and got a 780 ti which was very quiet.
Of course I really wanted to try out AMD Mantle so I got rid of that too and bought a Sapphire Tri-X OC 290x.
Unfortunately it is also pretty loud. Mine also has a lot of coil whine. It's too bad prices are plummeting for R9s cos I would consider going back to a 780ti due to comparable performance and quiet fans.
You will see people who will say theirs is quiet but I can't see how.