a tv can "display" any resolution you throw at it - just that 1280x720 will probably be unreadable. i find that on my tv i can only read text if its at 800x600 or less, so i would suggest using something like 800x450 if you want a readable display. As thats not a standard res, u might try entering it in the change resolutions > add custom mode thing in the nvidia display settings. But i dont know if you can adjust the main display and tv seperately though.