New HIS HD 6570... High temperatures during gaming...

Hi, well about a week ago, I purchased an HIS HD 6570, to replace my integrated graphics card. The actual card works great and is much better than the x4500HD's integrated graphics. However, there's one problem, I've been having with it... When I sometimes get very high temperatures.

I mean even on games that aren't that graphics intensive like S4 League or Crossfire, I'll still get around 60C-75C playing those on high settings.

Even when I'm not gaming, the card will run from around 60C to even 80C sometimes.

When I'm playing more graphics intensive game on high, like Champions Online, the card will get to around 90-95C...

So what do you guys think is causing this? Is it the fact that I have a weak 300w PSU? Or is it that I need to buy a fan for the card?

Or could it just be a software problem?