I have a ASUS G73JH with an ATI Mobility Radeon 5870 video card also and was getting same issue. Including frame tearing and pixelated graphics. and shut downs, which where related to my display driver crashing I updated my bios to 213 from 206 and the vbios update mentioned in that thread, I also updated to the latest catalyst drivers. Since updating I was able to play an hr and a half on 1920x1080 without issue. *Fingers crossed this continues to work* but so far no issues
Updating your Bios might help to 213 and then there is a vbios update that asus brought out to fix GSOD issue
Also this thread
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