Official System Requirements - Heroes 5

Damn, everything is optimized for Nvidia, I'm starting to regret that I have a Radeon:)

It depends on which Radeon you have. I have a 9800 Pro, and I think it will be enough. The game should run just as well on a 9600 Pro or XT. The main thing is to have at least 1 GB of RAM. As for optimizing for Nvidia, it's either because they paid for it, or because it's the most popular model... I hope it's the latter, otherwise Nival will become a sellout... ;) ;) :D :D :D :D (just kidding)