| Author |
Message |
Skybuck Flying
Guest
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 Posted:
Mon Oct 31, 2005 9:17 pm Post subject:
SLI... |
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Hello,
I once read some theory about how SLI works. (for Nvidia cards anyway).
(When two video cards are present in the pc connected via SLI etc)
One is the master card and the other is the slave.
The drivers or so ? would figure out how to load balance the stuff to the
two cards ?
So my question is actually two fold:
1. Do all games and graphics applications automatically benefit from SLI ?
2. Can programmers optimize games for SLI ?
If so how does case 2 work ?
What API's or tricks are available to optimize for SLI ?
Bye,
Skybuck. |
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Gernot Frisch
Guest
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| Posted:
Mon Oct 31, 2005 9:24 pm Post subject:
Re: SLI... |
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| Quote: | 1. Do all games and graphics applications automatically benefit from
SLI ?
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it's a driver thing - all games would benefit, I'd say.
| Quote: | 2. Can programmers optimize games for SLI ?
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Yes. Use extremely high resolution, so only SLI cards will be able to
render faster than a slideshow ;)
| Quote: | What API's or tricks are available to optimize for SLI ?
|
It's just, that on a SLI machine every card renders every 2nd line of
the image. Thus, half the work for each card. |
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Spack
Guest
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| Posted:
Mon Oct 31, 2005 11:09 pm Post subject:
Re: SLI... |
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"Gernot Frisch" <Me@Privacy.net> wrote in message
news:3smr6iFola6rU1@individual.net...
| Quote: |
1. Do all games and graphics applications automatically benefit from SLI
?
it's a driver thing - all games would benefit, I'd say.
|
From what I've read, it requires specific support for the game to be added
to as a profile. If there isn't one already for the game
(http://www.slizone.com/object/slizone_game.html), you need to create a new
one (http://www.slizone.com/page/slizone_appprofile.html)
| Quote: | 2. Can programmers optimize games for SLI ?
Yes. Use extremely high resolution, so only SLI cards will be able to
render faster than a slideshow ;)
What API's or tricks are available to optimize for SLI ?
It's just, that on a SLI machine every card renders every 2nd line of the
image. Thus, half the work for each card.
|
Read the SLI info on the nVidia site, and elsewhere. It doesn't do alternate
lines, that was what the 3dfx SLI rendering tech did.
Single Frame Rendering mode cause the upper half of the screen to be
rendered on one card, the lower half on the other.
Alternate Frame Rendering makes each card render a whole frame alternately.
Dan |
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Glzmo
Guest
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| Posted:
Tue Nov 01, 2005 7:16 am Post subject:
Re: SLI... |
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"Spack" <news@worldofspack.co.uk> wrote in message
news:3sn1doFo68a2U1@individual.net...
| Quote: |
"Gernot Frisch" <Me@Privacy.net> wrote in message
news:3smr6iFola6rU1@individual.net...
1. Do all games and graphics applications automatically benefit from SLI
?
it's a driver thing - all games would benefit, I'd say.
From what I've read, it requires specific support for the game to be added
to as a profile. If there isn't one already for the game
(http://www.slizone.com/object/slizone_game.html), you need to create a
new one (http://www.slizone.com/page/slizone_appprofile.html)
|
You can also create your own profile for each game and thus create your own
support. To do this, you can use the great utility called nHancer from
www.nhancer.com (which also allows you to adjust other driver settings for
each game easily). The utility will also allow you to use downloaded
custom-made SLI profiles that other users created (and they often run better
than the ones included in the Nvidia drivers).
| Quote: | 2. Can programmers optimize games for SLI ?
|
Yes, a programmer can include SLI support in his game just like he can build
in support for Anti-Aliasing or Anisotropic filtering.
| Quote: | Yes. Use extremely high resolution, so only SLI cards will be able to
render faster than a slideshow ;)
What API's or tricks are available to optimize for SLI ?
It's just, that on a SLI machine every card renders every 2nd line of the
image. Thus, half the work for each card.
Read the SLI info on the nVidia site, and elsewhere. It doesn't do
alternate lines, that was what the 3dfx SLI rendering tech did.
Single Frame Rendering mode cause the upper half of the screen to be
rendered on one card, the lower half on the other.
Alternate Frame Rendering makes each card render a whole frame
alternately.
Dan |
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