I was reading an article on Eurogamer about 'things PCs can learn from consoles regarding 4k content'. One of the takeaways was that it's possible to create an internal custom resolution of say ...

Although the current HDMI standard (HDMI 1.4) actually supports displays with very high resolutions, you'll face display or graphics card problems. E.g., driver and hardware (single link HDMI) of the ...

I think when you connect your PB to your TV using DVI/HDMI it will detect the resolution of the connected (HD)TV. If you choose not to mirror the content of the mainscreen you should be able to select ...