despite their claims, they do not do 3D over the 6800 series. Hopefully they come clean and provide more information on a resolution to this shortly
also, there is no benefit to a 150 cable. its a digital signal - it either gets there or it doesn't. Take it back and pick up a $5 or $10 at newegg or monoprice. Monster is snakeoil, especially for digital signals.
Its sort of akin to spending 10x on a 'better' ethernet cable hoping you'll get 'clearer' network traffic