Well I don't own GRAW so I can't exactly check for tearing
I do own PDZ... I haven't played much of it but I don't remember seeing any tearing.
The FIRST time I remember seeing it was when I downloaded the NFS demo, and I saw it again when I downloaded the Blazing Angels demo. Both times I only saw the screen tear two or three times over a 15 minute period.
Maybe my display just handles it better? I don't know
For references here are the games I own or have played through
Amped 3
Burnout Revenge
Call of Duty 2
Condemned: Criminal Origins
Dead or Alive 4
Elder Scrolls IV: Oblivion (CE)
Full Auto
Kameo: Elements of Power
Lara Croft Tomb Raider: Legend
Perfect Dark Zero (LE)
Project Gotham Racing 3
Ridge Racer 6
Tony Hawk's American Wasteland
RR6 and PDZ haven't got much play but I haven't noticed any screen tearing on any of the above games.