GPUs are a dying breed
@ 2007/12/18according to the steam survey the here, only 2.28% have 1920 capable monitors. The 'other' category that includes 30" 2560 * 1600 beasts as well as a few oddballs like the 1366 * 768 of the laptop I am on now has a mere 1.36%.
Lets assume that each level of AA and AF each takes double the GPU power of the predecessor. 2x takes twice the power of the normal, and 16x takes twice as much as 8x. If a HD3870 can run a modern game at 1920 * 1200 with 0x AA and 0x AF, then a 1920 * 1200 16x/8x will take 2^4x and 2^3x as much power.
Lets assume that each level of AA and AF each takes double the GPU power of the predecessor. 2x takes twice the power of the normal, and 16x takes twice as much as 8x. If a HD3870 can run a modern game at 1920 * 1200 with 0x AA and 0x AF, then a 1920 * 1200 16x/8x will take 2^4x and 2^3x as much power.