Dell XPS 15z overheating?

I had recently purchased dell xps 15z laptop. When i played Gta IV : EFLC on max settings, the cpu temp reaches 85 - 90

Is it normal. It doesn't shut down automatically.

And while playing flash games, the temp reaches 65 -70.

And while idle it its 50 - 55.

Please tell me if this is normal. 

Dell xps 15z (L511z)

Windows 7 home premium

Intel core i5-2410

6 Gigs of ram

750 Gigs of hdd