JazzB1987 said:
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This is generally a very misleading post. Just so much misinformation here that I can't get into.
AA isn't just a button press away from fixing everything. The more geometry on a a scene, the more jaggies there will be. The lower the resolution, the more noticeable said jaggies will be. To get a 576p crysis game looking as clean as it running at 1080p, the amount of resouces you would use for just the AA would be more than you would have needed to just up the resolution.
Lets not forget that lower rez also means lower overall clarity. Its easy ok looking at 480p on a 4.5-5" screen and saying its ok, but just ry blowing that up to 46" or 50" and it will become a horrible mess.
Besides, the whole point of AA is to eliminate jaggies thus cleaning up the image. The funny thing is, the absolute best type of AA is something called supersampling. What it basically does (for a 1080p image, you can apply this to any resolution too), is that the GPU renders your the game internally at 4K (1080p x 4) or even 8k. Then it downsamples that render and outputs the downsampled image at 1080p. Whole point of this is cause the higher up you go with rez, the less you will need AA. Problem with this is that its also the most expensive type of AA.
TL;DR? You use lower rez, you spend more on AA. Use higher rez, you spend less on AA and improve the overall clarity of the image.