Also, http://superuser.com/questions ... ing-a-pixel-to-the-screen
check answer #1 by John Carmack.
Those 1ms, 5ms, **** even 8ms are insignificant, considering total delay between GPU's frame rendering completion and moment when it gets drawn is always over 60 ms.
Of course there are gamers who claim that they can see the difference, they're morons though.