On the whole hz vs FPS issue:

""An average 17" monitor can reach 60 Hz, meaning that any performance reached by the game over 60 fps is discarded. For that reason it is not uncommon to limit the frame rate to the refresh rate of the monitor in a process called vertical synchronization. However, many players feel that not synchronizing every frame produces sufficiently better game execution to justify some "tearing" of the images."" - from the wiki http://en.wikipedia.org/wiki/Frame_rate

So that would mean people who use Vsyc on their GCs and in game but also "un-cap" the FPS are really just disabling the vsync? And console FPS is capped because (in general) TVs can support lower frequencies.

"For example, a card may render a game at 100 FPS on a monitor running 75 Hz refresh, but no more than 75 FPS can actually be displayed on screen."

I cant see how Rage and Doom 4 could be anything other that the same, graphically, Carmack is suggesting that a lower FPS can mean better gaphics, really it means more stability though.

Thanks techno. that helps tremendously.