Running Grand Theft Auto IV at 1080p
One crafty PS3 user has found a way to "force" Grand Theft Auto IV on the PS3 to run in 1080p. There are some caveats though, as the TV you are using but be connected through the PS3 with HDMI cables, the TV must be able to output 1080p, and the TV must be in the 40 inch range.
Video showing the process of running GTA 4 in 1080p on PS3
To run the game in 1080p you need to:
Go to to the display option under settings
Select video output settings
Select HDMI
Select custom
Untick 1080i and 720p
Press X
Press X again
Select finish
Launch game
While we know it works from the Youtube video above we haven't gotten any proof that it actually makes the picture look any better, or if it looks better than the Xbox 360 version because of this. We leave it up to you, our trusted reader, to try it and let us know if you get a substantial graphics boost. Let us know.
Update: Patrick at Ripten shot me an email to let me know that "Even though your PS3 will output at 1080p, the game is still being rendered at 640p, but being upscaled to 1080p (by the PS3 itself)"
Source:Talk Playstation.com

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HD Gaming era starts with the PS3!!!
STFU Sony