I also use PAL and I found that just about all PAL TV's without NTSC can only do resoulutions of 640x480.
Doesn't the software that comes with the card have a feature for adjusting screen positioning?
Another thing you should do is set your refresh rate to 60Hz as the only TV I have personally seen that can do anything greater in a Sony Trinitron!

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<_-ShaGGy-_>