Noisy fans & "high" temperature

I have just gotten my new MacBook Pro 15" Retina the newest and biggest model, with the Radeon R9 M370X graphicscard

The fans are spinning with 3000 rpm as soon as im watching twitch.tv on source, or opening a game(Heroes of Newerth), and are getting about 70 c warm. The fans are quite noisy. Is it me, or should this mbp 15 be able to do pretty simple tasks, that doesn't require much to run?

I got it yesterday and had it replaced with a new one today, since the fans where running at full speed all the time, and AppleCare couldn't locate it to a software problem. This model is better, but it still annoys me that the fans are making noise just by watching stream.