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AMD Say Nvidia "completely sabotaged our performance" with HairWorks

AMD Say Nvidia Sabotaged AMD's Performance.

The Witcher 3 dev explains visual downgrade

AMD Say Nvidia "completely sabotaged our performance" with HairWorks

 

AMD Say that Nvidia "completely sabotaged our performance" with HairWorks by forcing much more of a performance hit than is required by the affect. 

AMD's chief gaming scientist, Richard Huddy, said that Nvidia had deliberately sabotaged AMD performance with their GameWorks code, saying this to Arstechnica;

 

 “We’ve been working with CD Projekt Red from the beginning. We’ve been giving them detailed feedback all the way through. Around two months before release, or thereabouts, the GameWorks code arrived with HairWorks, and it completely sabotaged our performance as far as we’re concerned. We were running well before that… it’s wrecked our performance, almost as if it was put in to achieve that goal.“

 

AMD Say Nvidia         

As many of you know, players of the Witcher 3 have been able to dramatically decrease the performance hit of Nvidia's HairWorks by limiting the amount of tessellation it uses.

By default the affect uses 64x tesselation, which places significant load on the GPU. This especially hurts AMD GPUs as AMD's GPUs have significantly less Tessellation performance than Nvidia's equivalents.

Looking at the screenshots below, which shows HairWorks running on the Witcher 3 at 8x, 16x and it's default 64x tessellation, showing that after 16x tessellation the visual difference is barely noticeable, making it look like Nvidia have purposefully increase the tessellation on the affect to make the affect hit AMD GPUs much harder than theirs.

using 64x tessellation is a double edged sword however as it increases the load of users of AMD and Nvidia GPUs, so performance is decreased for both brands, just one is hit much harder than the other. 

 

  AMD Say Nvidia   AMD Say Nvidia

AMD Say Nvidia

(Images from WCCFtech)  

 

HairWorks is no doubt a brilliant affect to use, as it really increases the realism of every creature and character which uses it, Nvidia needs to explain why such a high level of tessellation is used in the affect as looking at the pictures above it could have a 4x decrease and still look as good. 

AMD have been working on their tessellation performance in recent years, with their new Tonga, GCN 1.2 architecture doubling its performance under tessellated loads, though right now AMD have only one GPU using this architecture. AMD will need to refresh their high end lineup soon with new silicon to decrease the affect of these kinds of issues in the future, but right now the Witcher 3's issues look like a combination of known performance differences between AMD and Nvidia which have been taken advantage off in a very dirty way.

 

You can join the discussion on AMD's Sabotaged performance in the Witcher 3 on the OC3D Forums. 

 

 

AMD Say that Nvidia "completely sabotaged our performance" with HairWorks.http://www.overclock3d.net/articles/gpu_displays/amd_say_nvidia_completely_sabotaged_our_performance_with_hairworks/1

Posted by OC3D on Friday, 22 May 2015
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Most Recent Comments

22-05-2015, 07:29:23

ShaunB-91
I'm sure I saw yesterday that a simple tweak fixes things on AMD GPU's.Quote

22-05-2015, 07:31:28

WYP
Quote:
Originally Posted by ShaunB-91 View Post
I'm sure I saw yesterday that a simple tweak fixes things on AMD GPU's.
Yeah it does, shows that Nvidia may have put the tessellation so high to force AMD to take a larger hit than is needed for the same visual affect.Quote

22-05-2015, 07:48:28

Warchild
Quote:
Originally Posted by WYP View Post
Yeah it does, shows that Nvidia may have put the tessellation so high to force AMD to take a larger hit than is needed for the same visual affect.
Yep I gave a link to it in the Quick news I think, or maybe small talk.

Here it is again

AMD potential fixQuote

22-05-2015, 07:57:39

barnsley
Quote:
Originally Posted by Warchild View Post
Yep I gave a link to it in the Quick news I think, or maybe small talk.

Here it is again

AMD potential fix
AMD's 15.5 beta also has some improvements and they have a guide on what to do as well. Its very similar to the one you linked.

link.Quote

22-05-2015, 08:47:36

Chopper3
I may be being dim here but how did NVidia do this? I'm sure AMD are right and that they're impacted by this setting but did NVidia pay for the developers to do this or coerce them in some way? Also how did this get to release without AMD spotting this and having it 'fixed'?Quote
Reply
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