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NVIDIA Announces 16x AA For SLI
In response to ATI's CrossFire launch, NVIDIA has revisited a few points
about their own solution, as well as revealed some sneak peeks into the
future of their SLI technology.
Of course, one of the key points NVIDIA wanted to make was that their game
support is no less than ATI's. Initially, either games needed profiles setup
in order to run, or users had to know how to hack the NVIDIA XML file.
NVIDIA is now offering the ability to enable user selected SLI modes for
games that do not have profiles. Profiles will take precedence over user
selected modes, but even games whose profiles disable SLI will allow the
user to force it on.
Their other real point of contention with ATI is their claim that they add
quality options where NVIDIA does not. As we know, ATI is enabling 10xAA and
14xAA options for games that don't see any real benefit from SLI otherwise.
In order to top the announcement that ATI made, NVIDIA has revealed that
they are planning on bringing out a 16xAA mode via SLI in a driver to be
launched in early July.
We haven't gotten as much detail about this implementation as we currently
have on ATI's AA modes. We don't know what the final sample point patter
will look like, but NVIDIA has said that they will provide this detail when
they finalize it themselves. We do know that, regardless of what NVIDIA
decides, their 16x mode will be a combination of 4x multisampling and 4x
supersampling. The debate currently is whether or not to implement
supersample AA via an increased resolution or by rendering the scene 4 times
with each rendering being slightly shifted. The advantage of the latter
method is that rotated grid SSAA can be used, but the disadvantage is that
the geometry load would be increased. NVIDIA has told us that they can do
either method but haven't decided which to settle on.
Why is 4xSS plus 4xMS equal to 16xAA? Because each supersample point
contains 4 multisample points giving us 4 times the multisample points. The
other advantage is that SSAA applies to the entire scene, so we get 4xSSAA
applied to parts of the scene that would see no benefit from multisampling
(the interior of polygons and textures).
This mode will not be a simple combination of two scenes rendered with the
current 8xAA, but rather each card will render 4xSS + 4xMS. For alternate
and split frame rendering, each card will be doing full 16xAA. This may also
give us a glimpse into the future as each generation graphics cards continue
to increase in power. Doing full 16xAA on each card means we could see this
order of AA running on a single card in a generation or so.
We are definitely interested in testing this mode when it comes along early
next month.
NVIDIA Announces 16x AA For SLI
In response to ATI's CrossFire launch, NVIDIA has revisited a few points
about their own solution, as well as revealed some sneak peeks into the
future of their SLI technology.
Of course, one of the key points NVIDIA wanted to make was that their game
support is no less than ATI's. Initially, either games needed profiles setup
in order to run, or users had to know how to hack the NVIDIA XML file.
NVIDIA is now offering the ability to enable user selected SLI modes for
games that do not have profiles. Profiles will take precedence over user
selected modes, but even games whose profiles disable SLI will allow the
user to force it on.
Their other real point of contention with ATI is their claim that they add
quality options where NVIDIA does not. As we know, ATI is enabling 10xAA and
14xAA options for games that don't see any real benefit from SLI otherwise.
In order to top the announcement that ATI made, NVIDIA has revealed that
they are planning on bringing out a 16xAA mode via SLI in a driver to be
launched in early July.
We haven't gotten as much detail about this implementation as we currently
have on ATI's AA modes. We don't know what the final sample point patter
will look like, but NVIDIA has said that they will provide this detail when
they finalize it themselves. We do know that, regardless of what NVIDIA
decides, their 16x mode will be a combination of 4x multisampling and 4x
supersampling. The debate currently is whether or not to implement
supersample AA via an increased resolution or by rendering the scene 4 times
with each rendering being slightly shifted. The advantage of the latter
method is that rotated grid SSAA can be used, but the disadvantage is that
the geometry load would be increased. NVIDIA has told us that they can do
either method but haven't decided which to settle on.
Why is 4xSS plus 4xMS equal to 16xAA? Because each supersample point
contains 4 multisample points giving us 4 times the multisample points. The
other advantage is that SSAA applies to the entire scene, so we get 4xSSAA
applied to parts of the scene that would see no benefit from multisampling
(the interior of polygons and textures).
This mode will not be a simple combination of two scenes rendered with the
current 8xAA, but rather each card will render 4xSS + 4xMS. For alternate
and split frame rendering, each card will be doing full 16xAA. This may also
give us a glimpse into the future as each generation graphics cards continue
to increase in power. Doing full 16xAA on each card means we could see this
order of AA running on a single card in a generation or so.
We are definitely interested in testing this mode when it comes along early
next month.
