In recent years AMD has improved open GL rendering performance but in the past they have been behind. Never having played the game myself I wouldn't know about the individual idiosyncrasies on certain hardware so I can only speculate relative to other games of its age.
There is no extended warranty through ASUS but I would advise looking into Square Trade. Their warranties offer repair or replacement up to the purchase amount. Just be sure that you get your receipt on file with them as soon as you get your item so that if you lose your copy you can still collect on the warranty if need be in the future.
A bus station is where a bus stops. A train station is where a train stops. On my desk, I have a work station…