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Old 06-24-04, 08:52 PM   #2
ChrisRay
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Join Date: Mar 2003
Location: Tulsa
Posts: 5,101
Default Re: 6800 Series Anti Aliasing Sample patterns

I collected data and gathered results.

Note: All data gathered, With the exception of the Reference shot with no AF is done with 16x Quality Anistropic Filtering.


No AA/NoAF: Reference Point. Performance used as baseline

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/noaa.png


2xAA/16xAF: Marginal performance Hit from moving from 2xAA/16x Quality AF, Large increase in Image Quality.

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/2xAA.png


2xQAA/16xAF: Performance hit as shown is similar to 2xAA, the blurring side effect of quincunx can be seen here.

Image Quality Shot

http://www.nvnews.net/articles/chris...arison/2xq.png


4xAA/16xAF(RGMS): With Nvidias New 4x RGMS pattern the jump from 2x to 4x is about the same as the jump from from no anti aliasing to 2x. Bringing significant quality improvements at a very marginal frame rate hit from 2x. Highly recommended mode for 6800 users. Please note horizontal edges and how 4x AA effectively removes aliasing.

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/4xAA.png


4xAA/16xAF(OGMS): Nvidias old legacy 4x Multi Sampling. This mode is also found on NV2x/NV3x Variant Nvidia GPUs, It employs the same compression as Nvidias new mode. It does appear to be marginally faster than the new mode. However it doesnt do much for horizontal edges at all rendering it pretty useless in comparison to the 4x RGMS pattern

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/4xogms.png


4x9tap/16xAF: As seen on the original NV2x/Nv3x GPUS, This mode is a bit slower than 4x multisampling modes. An exception seems to be Unreal Tournament 2004 which seems to not differ in performance much at low resolutions. More bandwith limited titles/resolutions will show more of a disparity.

Image Quality Shot

http://www.nvnews.net/articles/chris...son/4x9tap.png


8XS/16xAF: Impressive results. Able to maintain an average of 50 + FPS in the Antalus Map. This setting has proven to be more usable than I expected. (Recommended for Jagged edge nuts) Offers twice the performance of the old 8xS mode and seems to remove horizontal edges better. Compare to the old 8xS Mode.

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/8xAA.png


16xS/16xAF: The new 16x is exclusive to people with NV40 variant graphic cards. This mode is overkill. It does however provide the absolute best Image Quality. It effectively removes aliasing better than any other mode nvidia offers and also serves to sharpen textures. It does however have dire effects upon performance.

http://www.nvnews.net/articles/chrisray_iq/16xS.png


16xAA(SS)/16xAF: The other 16x pattern within Nvidia drivers is 16x Super Sampling. Its quality seems slightly below 16xS when it comes to edge removal. However texture quality will be very high using this mode. Performance is very low due to the massive fillrate and bandwith requirements.

http://www.nvnews.net/articles/chris...on/16xogss.png


4xS/16xAF: This result surprised me alot. I absolutely cannot see any reason to use this mode on a Geforce 6800, While one of my favorite modes on the geforce FX series, the 4x Multi Sampling mode completely obsoletes this method. Providing twice the frame rates at the same Image Quality. One thing to note is that UT2004 shows an unusual anomaly compared to other aps. Generally 4xS is few frame per second faster than 8xS.

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/4xSAA.png



2x1/16xAF: Not really an ideal Gaming mode. This mode is useful for playing Old Games with Alpha Texture, Doesnt effect horizontal aliasing at all

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/2x1.png


1x2/16x AF: Same as Above, Not ideal Gaming Mode. This mode is useful for playing Old Games With Alpha Textures, Doesnt effect Vertical Aliasing at all

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/1x2.png


2x2/16x AF: Best Legacy AA Mode. Pure Super Sampling. Works excellent in older titles which have trouble with Multi Sampling. Image Quality Comparable to 4x ordered grid multi sampling

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/2x2.png


Old 6xAA/16xAF: Another not terribly useful mode. This mode was originally used during the launch of the Geforce FX 5800 Ultra. It was
highly criticized for not being much better than 4x. There is not much use
to this current mode.

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/old6x.png


12xAA/16x AF: Not Terribly useful. IQ results above 4x Multi Sampling are marginal. Hybrid mode so not even paticularly useful for Alpha textures.

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/12x.png


Old 8xS/16xAF: Interesting mode. Edge removal is comparable to New 8xS mode. However it does tend to offer better quality on textures due to it being super sampling. Not reccomended unless you want sharper textures. Be sure to compare to the new 8xS.

Image Quality Shot

http://www.nvnews.net/articles/chrisray_iq/old8xS.png



Performance: For the new graph I decided to use DM: Ice Tomb because it more effectively limits the GPU than Antalus. All tests were conducted with max quality in DM Icetomb. I took three preset runs and divided the results to reduce margin of error. Margin of error was within .5 FPS.




To Enable: To Enable copy this .cfg to your riva tuner and remove your old AA .cfg settings.

Code:
[ForceWareFSAAModes]
FSAAMode01 = 2 x 1
FSAAMode02 = 1 x 2
FSAAMode05 = 2 x 2
FSAAMode0E = 2x
FSAAMode0F = Quincunx
FSAAMode10 = 4x RGMS
FSAAMode12 = 4x 9-tap
FSAAMode13 = 4xS
FSAAMode17 = 12x
FSAAMode19 = Old 8x
FSAAMode1A = 16x Hybrid
FSAAMode16 = Old 6x (D3d)
FSAAMode18 = New 8x
FSAAMode1B = 4x Gamma Corrected
FSAAMode0D = 16x OGSS

Conclusion: Nvidias new 4x mode results in the best balance of image quality and performance. However there is lot of tweakability within Nvidia's drivers, Finding a mode that suits you shouldnt be hard.


Final Note: Unfortunately there are some minor discrepancies in my Image Quality shots. I apologise for this. Due to the fact that I was unlocking these modes over a course of time.. Some modes were not taken at the exact "position" and time frame. I do intend to correct this as soon as possible.
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Last edited by ChrisRay; 04-17-05 at 07:37 PM.
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