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Guru3D.com » News » NVIDIA Kepler not fully compliant with DirectX 11.1

NVIDIA Kepler not fully compliant with DirectX 11.1

Posted by Hilbert Hagedoorn on: 11/23/2012 08:37 AM | 37 comment(s) ]

After a discussion on a German a website, NVIDIA confirmed that the Geforce 600 series does not fully support DirectX 11.1 aka is 100% compatible. Well, it doesn't fully support the API. The GTX 680 supports DirectX 11.1 with hardware API eature level 11.0, including all optional features. 

Now that does include a number of features useful for game developers such as ... 

Reply directly from NVIDIA:

  • Partial constant buffer updates
  • Logic operations in the Output Merger
  • 16bpp rendering
  • UAV-only rendering
  • Partial clears
  • Large constant buffers 


We did not enable four non-gaming features in Hardware in Kepler (for 11_1): 

  • Target-Independent Rasterization (2D rendering only)
  • 16xMSAA Rasterization (2D rendering only)
  • Orthogonal Line Rendering Mode
  • UAV in non-pixel-shader stages 


So basically, NVIDIA does support 11.1 features with 11_0 feature level through the DirectX 11.1 API.

"We do not support feature level 11_1. This is a bit confusing, due to Microsoft naming. So we do support 11.1 from a feature level for gaming related features."

The competitions AMD's Radeon HD 7000 "Southern Islands" GPU series is fully compliant with DirectX 11.1 (except the rebranded products from the 6000 family).






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airbud7
Maha Guru



Posts: 2009
Joined: 2011-07-20

#4463043 Posted on: 11/25/2012 10:39 PM
Sh1t son I got dx 11.2 ya all wanna see it?


No!

BTW, Down here in tha south we call that...medium size :banana:

sykozis
Ancient Guru



Posts: 13486
Joined: 2008-07-14

#4463067 Posted on: 11/25/2012 11:18 PM
Bro AMD is far from dying. AMD chips are what is going into all of the next gen consoles. AMD A10 APU in PS Orbis etc.

If they were in danger of dying as a company, Microsoft, Nintendo, and Sony would not all 3 go to them for their chips....

Even if it gets to the point where they cant sustain themselves anymore, a company will surely grab them up, you can count on that.

We will still have Radeon and AMD CPU's for a good long time yet.

Although they may one day in the not so near future, refine their APU's to the point where they can just sell those and yield great performance.

Spouting crap like AMD is dying is just rubbish. Name change one day? Maybe.

AMD is running out of money. Most of us consider that "dying"....

---TK---
Ancient Guru



Posts: 14693
Joined: 2005-12-10

#4463078 Posted on: 11/25/2012 11:28 PM
hopefully they have enough coin to pay their driver team

omnimodis78
Newbie



Posts: 8
Joined: 2010-07-30

#4463157 Posted on: 11/26/2012 01:02 AM
Absolutely not an issue whatsoever! Firstly, DX11.1 is useless in a practical sense; plus, if Windows 8 is out of the picture, it doesn't even matter because the DX11.1 "patch" for Windows 7 is fully supported by the Kepler architecture. In any case, all's good nvidia, just keep the kick-ass drivers coming!

Ven0m
Maha Guru



Posts: 1035
Joined: 2005-08-12

#4463441 Posted on: 11/26/2012 10:26 AM
These unsupported features seem to only concern some future professional applications - I'm pretty much sure they'll want to use that to differentiate cards between gamer GeForce and workstation Quadro / Tesla.

Lane
Ancient Guru



Posts: 4866
Joined: 2005-02-25

#4463526 Posted on: 11/26/2012 01:32 PM
These unsupported features seem to only concern some future professional applications - I'm pretty much sure they'll want to use that to differentiate cards between gamer GeForce and workstation Quadro / Tesla.


Sadly not... but this dont mean they will be use by developpers in the games released in 2013. Hence why i continue to say this is not really important..

MS have not release the DX11.1 features 3 months ago.. thoses was determined a long time ago, and basically most are supported on hardware level 11_0 by the API. Some need an hardware level change and it seems Nvidia have not include them on their hardware. ( And im sure there's a good reason for it, lets not forget the 2012 Kepler is empty of all computing parts too, maybe it was enter in conflict with it ) That is just that.

......Kepler supports UAVs in pixel and compute shaders. But not in tessellation related (hull and domain shader) or any other shader type before the rasterizers. And in my opinion, that is gaming relevant. Use of UAVs in vertex, geometry, hull and domain shaders have no potential use for anything outside of gaming. Where else does one use this shader types? So nV's claim they support all gaming relevant DX11.1 features is plain wrong in my opinion.
If I'm not mistaken, they don't support a single feature of level 11_1 which is not optional for level 11_0.......

..... It might just be that Microsoft didn't want UAV acces by all shader types to be a new option for level 11_0. If Kepler doesn't support 64 UAV or TIR or anything else from level 11_1, there is no way for Nvidia to expose UAV access by all shader types......

.... UAV is a random access (read | write) view on a buffer. You can do scattered writes to an UAV fe. You can already render out into UAVs if you want in 11.0
I think you can not go without RT _and_ DS (+UAV) in 11.0, because then the whole pipeline goes to sleep basically. I'd say the "feature" it's really only a guarantee that nothing just turns off, you should be able to do the feature itself without problems if your hardware isn't a bit inflexible.
nVidias problem is likely the 64 UAVs, not that you can't turn off RT & DS together.....

..... You also loose the resolution-information when you don't have a RT&DS bound, there it goes hand in hand with the "Target-Independent Rasterization" feature of DirectX 11.1.....


Then again it is really specific, and this will have surely no impact at all.

IPlayNaked
Banned



Posts: 6559
Joined: 2009-10-12

#4463607 Posted on: 11/26/2012 03:23 PM
AMD is running out of money. Most of us consider that "dying"....


Worst case would be bankruptcy and restructuring, or a buyout, and you know it.

They're not dying.

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