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Whats the difference between AA and QSAA?

post #1 of 10
Thread Starter 
I am curious what the difference is between anti aliasing (AA) and QS anti aliasing (QSAA). I've noticed the QSAA option recently in a few games I have. Is one better quality than the other? Whats the deal?
post #2 of 10
Thread Starter 
Wow 40 views and no one knows the answer? At least I don't feel ignorant anymore :P
post #3 of 10
A "Q" and an "S".
post #4 of 10
Isn't QSAA shorthand for Nvidia's quincunx? Roughly 3x MSAA at a 2x MSAA cost.
post #5 of 10
Yes it's quincunx, and it's just a different pattern of anti-aliasing used on each pixel.
post #6 of 10
Thread Starter 
So... then is QSAA better? about the same?
post #7 of 10
Like I said, it's roughly the equivalent of 3x MSAA. Better than 2x, worse than 4x.

It gives you edge AA that is the same as 4x, but then introduces some texture blurring that you don't get with MSAA.
post #8 of 10
Thread Starter 
I still don't quite understand. It would be one thing if I could only choose between AA and QSAA What if I have the option of say, 16x AA or 16QSAA. Are you saying there is more filtering going on in QSAA no matter if it says it is doing the same number of passes?
post #9 of 10
Let's put it another way. 16x QSAA would give you the same level of edge anti-aliasing as 16x MSAA, at the same cost as 8x MSAA. The trade-off is that textures will become blurrier, making 16x AF look like 4x AF.

MSAA is the quality option, QSAA is the speed option. In things like racing games, where you are moving too quickly for slight texture blurring to matter, but aliasing is super-apparent, then QSAA is a great choice. In something like Borderlands, where the unique texturing is a huge feature of the game, then QSAA is a crappy choice.

Personally, I say throw on 4x MSAA and 4x non-optimized AF and call it a day. Anything more is really a case of severely diminishing returns. Anything less is failing to take advantage of features that are essentially free on any moderately current card.
post #10 of 10
Thread Starter 
ah ok I get you thanks for the help.
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