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Old 07-08-04, 01:07 AM   #25
jimmyjames123
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Default Re: NV40 Anisotropic Filtering Investigation

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To answer the ATi question, it's because ATi use Brilinear instead of Trilinear so that it makes their cards look better compared to Nvidia's.
Not exactly. Note that NV has trilinear optimizations enabled by default, and most reviewers have been testing the NV cards with tri optimizations enabled. One of the real issues here is regarding anisotropic optimizations. It seems pretty clear to me that ATI is using both trilinear and anisotropic filtering optimizations by default, so one would think that it would only be fair to bench against the NV cards that also use tri and aniso filtering optimizations enabled in the driver. However, before that can be done, a detailed image quality analysis using pictures and in-game visual quality inspection should be done that compares ATI's optimized modes to NV's optimized modes.
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Old 07-08-04, 02:28 AM   #26
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Default Re: NV40 Anistropic Filtering Investigation

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ChrisRay, when you have some time, it would be very interesting to see how fps changes in FarCry when you use the various modes detailed in your review. I suspect that we would see a relatively small performance hit when AF is applied to the 6800 cards if the aniso and tri optimizations are both enabled in the drivers.

Finally, generally, what are your thoughts on the image quality on the 6800 when using performance mode with tri and aniso optimizations enabled?
Sometimes it works, Sometimes it wont. However performance + Tril Optimisations + AF optimisations presents very noticable banding,

Performance + Tril Optimisations is usually ok, It depends on game though, sometimes Anistropic Optimisations cause no harm, Sometimes their results arent pretty.

The reason AF in High Performance/Performance mode is so cheap is because AF is reverted all the way back to Bilinear filtering when the AF opts are on.

Chris
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Old 07-08-04, 02:33 AM   #27
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Default Re: NV40 Anistropic Filtering Investigation

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Originally Posted by MikeC
It was me.
ah ok
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Old 07-08-04, 02:53 AM   #28
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Default Re: NV40 Anisotropic Filtering Investigation

great job
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Old 07-08-04, 03:15 AM   #29
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Default Re: NV40 Anisotropic Filtering Investigation

Edited by MUYA Can you stay on topic. Thanks

Last edited by MUYA; 07-08-04 at 03:28 AM.
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Old 07-08-04, 04:23 AM   #30
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Default Re: NV40 Anisotropic Filtering Investigation

in short a word,

condemnation to NVIDIA is good.

condemnation to ATI is Bad.
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Old 07-08-04, 04:40 AM   #31
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Default Re: NV40 Anisotropic Filtering Investigation

All they want is for you to stay on topic, This isnt about ATIS AF.
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Old 07-08-04, 04:56 AM   #32
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Default Re: NV40 Anisotropic Filtering Investigation

A couple of questions

1) If bilinear has no performance hit and trilinear has no performance hit, as you state for modern graphcs cards, then why have trilinear optimisations and/or brilinear ? I'm probably being dumb on this one

2) How long did it take you to do the tests ?

I'm going to look at all the images tonight , but with so many permutations even that will take a while. And that's just for one game. I bet I set it up one way then a few days later have nagging doubts and start perpetually tweaking again ??

Regards

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Old 07-08-04, 05:07 AM   #33
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Default Re: NV40 Anisotropic Filtering Investigation

Quote:
Originally Posted by Cheetah70miles
in short a word,

condemnation to NVIDIA is good.

condemnation to ATI is Bad.
In short, find your own soapbox in a corner somehwere, stop stay on topic. The topic and the purpose of this thread is to discuss NV40's AF, (note NV40s) and that is all. We don't need over zealous posts on your behalf. For that you can start your own forums but while you are here you are expected to conduct yourself to MikeC's, nV News forum rules and standards as upheld by us Moderators.

If you insisit on proceeding with such behaviour the moderating team may have to dicuss banning you. We welcome anyone to our forums provided they follow our guidlelines which your above post does not. If you action persists you will leave us with no choice.

Thank you.
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Old 07-08-04, 05:42 AM   #34
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Default Re: NV40 Anisotropic Filtering Investigation

Quote:
Originally Posted by zakelwe
A couple of questions

1) If bilinear has no performance hit and trilinear has no performance hit, as you state for modern graphcs cards, then why have trilinear optimisations and/or brilinear ? I'm probably being dumb on this one

2) How long did it take you to do the tests ?

I'm going to look at all the images tonight , but with so many permutations even that will take a while. And that's just for one game. I bet I set it up one way then a few days later have nagging doubts and start perpetually tweaking again ??

Regards

Andy
1) Bilinear and Trilinear filtering seperately do not have a large performance hit on modern graphic card, Ever since the introduction of the Second TMU On the Geforce cards has this been the case. However Anistropic Filtering (can sample pixels up to 16 times and still apply Trilinear filtering) This is a major fill rate bottleneck. I did mention Anistropic Filtering is a different story.

2) It took a while. I think 2 days working for several hours, It's not as much doing it. But you also have to make sense of the data and figure out what it all means.

Chris
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Old 07-08-04, 07:22 AM   #35
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Default Re: NV40 Anisotropic Filtering Investigation

Thanks for clearing the first point up, I was forgetting you can have both applied and so therefore it compounds the effect.

I can see myself walking up and down some of the metal gangways tonight to see which is the best compromise for me.

Regards

Andy
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Old 07-08-04, 09:28 AM   #36
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Default Re: NV40 Anisotropic Filtering Investigation

Great review thanks!
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