Sorry to be a dumbarse but how did u run the PC Demo in 720p?
Well I connected my laptop to my plasma, changed my 3D settings to display 720p resolution in 60Hz in the nvidia control panel, then changed resolution to 720p in the pes 2010 demo settings.
I found difference between playing in 50Hz and 60Hz. On 50Hz the game was tearing, on 60Hz much smoother.