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Old 3rd September 2015, 13:42   #1  |  Link
NikosD
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Nvidia scandal with Async Compute support (DX12)

Nvidia refuses to reply officially but the truth is there and should be uncovered fully.

Nvidia DX12 cards, even latest Maxwell 2.0, do not support Async shaders in HW.

Fermi, Kepler and Maxwell 1.0 don't support Async shaders at all and Maxwell 2.0 supports that feature using software scheduling, which means practically is not supported.

DX12 games are not ready yet in quantities to see how much gain could give this feature to AMD GCN 1.x-only cards, but from the well-known game benchmark the gain is huge.

Maybe Pascal could change that, but as it is right now the AMD GCN card owners, should be more than happy.

http://wccftech.com/nvidia-amd-direc...s-explained/4/
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Old 3rd September 2015, 19:35   #2  |  Link
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real life result is what matters though.
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Old 4th September 2015, 13:31   #3  |  Link
NikosD
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real life result is what matters though.
The game - benchmark is pure real life.

The actual game shares its game engine with the benchmark.
It's just one game till now.

Don't expect the situation to change a lot though with other games.
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Old 6th September 2015, 07:00   #4  |  Link
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At last!

The scandal of Nvidia tactics regarding Async Compute and the pressure to developers to cover it, has been uncovered broadly to a wider extent than the original Async Compute scandal.

"Given its growing market-share, NVIDIA could use similar tactics to keep game developers away from industry-standard API features that it doesn't support, and which rival AMD does. NVIDIA drivers tell Windows that its GPUs support DirectX 12 feature-level 12_1. We wonder how much of that support is faked at the driver-level, like async compute. The company is already drawing flack for using borderline anti-competitive practices with GameWorks, which effectively creates a walled garden of visual effects that only users of NVIDIA hardware can experience for the same $59 everyone spends on a particular game."

http://www.techpowerup.com/215663/la...irectx-12.html
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Old 6th September 2015, 07:53   #5  |  Link
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That "scandal" is a whole bunch of noise over not much IMO - unrelated to HEVC decoding in any case - you come across with a bit of an anti-NVidia agenda FWIW (You work for Intel or something ?).
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Old 6th September 2015, 09:52   #6  |  Link
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It's soon to discuss about DX12. We should blame Microsoft first x)
And since I know, it does nothing with DXVA
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Old 6th September 2015, 10:12   #7  |  Link
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You clearly have misunderstood something.

DX12 is a brand new low level and real multi-threaded API like Mantle and OpenGL Vulcan or Apple's Metal.

It is more than clear that Nvidia wasn't expecting or didn't manage to stop this evolution on the PC graphics and their GPUs are still optimized for DX11, which is not low level or real multi-threaded.

So, for the first time in recent GPU history, AMD GCN cards (from late 2011 onwards) can really expose the power of their HW which can be leveraged more efficiently than ever by ALL low - level APIs like DX12 and Vulcan.

So, for the first time in recent history, AMD cards are more future - proof and a lot better value - for - money than Nvidia cards.

In just one day, July 29th of 2015, with the official release of Win10 and DX12, things turned over and AMD is on top again.

We are here to watch Nvidia struggling with Marketing (money), Blackmails (money), Media (money) to change the picture like Intel tried to with the release of AMD Athlon back on 1999.

That's why I like AMD.

A small company fighting with the giants.
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Old 6th September 2015, 10:16   #8  |  Link
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The techpowerup article is just a rehash of the Oxide Async Compute thing, I don't see how its anything new or "uncovered broadly to a wider extent than the original Async Compute scandal"
Funny enough everytime it gets re-hashed, it presents the situation slightly differently. Need to draw readers, I guess?

I don't even understand how people make everything a scandal these days.
So NVIDIA emulates one DX12 feature in software - thats not forbidden, and unless they explicitly stated the opposite, also not worth a scandal.

Performance numbers of actual games in the future will determine the merit of which card to buy, not theoretical feature limitations and so-called "scandals".
If this feature is so important, than performance will show it on DX12 titles (once we have more than one single benchmark), and that alone should be a driving factor.
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Old 6th September 2015, 10:26   #9  |  Link
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You have to read again the paragraph I quoted here.

What it's been uncovered, is a pressure of Nvidia to cover the "cheat" of the driver exposing Async Compute which is not implemented yet.

The reason of not implemented is because it is based on SW scheduling and other slow SW processes that AMD supports in HW.

Nvidia tried to attack by saying that activating Async Compute is a biased move with code specifically written for AMD (!)

What a lie (!).
It's exactly the opposite.

Nvidia demanded to remove Async Compute code when running on their HW because although it was exposed by the driver it wasn't implemented.

Now, read again the last paragraph and remember the 4GB RAM-gate of 970.

Nvidia is FULL OF LIES.
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Old 6th September 2015, 10:39   #10  |  Link
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Quote:
Originally Posted by nevcairiel View Post
The techpowerup article is just a rehash of the Oxide Async Compute thing, I don't see how its anything new or "uncovered broadly to a wider extent than the original Async Compute scandal"
Funny enough everytime it gets re-hashed, it presents the situation slightly differently. Need to draw readers, I guess?

I don't even understand how people make everything a scandal these days.
So NVIDIA emulates one DX12 feature in software - thats not forbidden, and unless they explicitly stated the opposite, also not worth a scandal.

Performance numbers of actual games in the future will determine the merit of which card to buy, not theoretical feature limitations and so-called "scandals".
If this feature is so important, than performance will show it on DX12 titles (once we have more than one single benchmark), and that alone should be a driving factor.
I don't want to change anything on my previous post because it was written before you complete your post and had already replied why it was A REAL SCANDAL before you ask !

I have to become an Oracle after all.
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Old 6th September 2015, 10:45   #11  |  Link
nevcairiel
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Everything on the internet is a scandal these days.
Next year when DX12 becomes actually relevant, people will buy whatever GPU is the fastest, and if by chance thats going to be NVIDIA, noone is going to care anymore.
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Old 6th September 2015, 10:54   #12  |  Link
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No, not everything on the Internet is a scandal these days.

REAL SCANDALS can spread faster due to internet when they are uncovered.

What is going to happen next year, let next year to worry about.

We are talking about today that Nvidia did lie again about their HW capabilities which are lower than expected and missing from their drivers although exposed by them (!) and that AMD cards are better suited for low - level APIs like DX12 and Vulcan.

All GCN graphics cards owners should be more than happy for their buy regarding DX12 games, in clear contrast with the Nvidia cards owners regarding value-for-money and DX12 games.
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Old 6th September 2015, 18:51   #13  |  Link
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Real-life performance in the applications you're using is what matters - obviously HW manufacturers make different design tradeoffs, and it's way too early to speculate about which will work out best. Focusing on one specific feature may expose these differences, but is meaningless.
AMD & NVidia are in the same boat, the real competition is Intel, slowly eating away at their GPU pie (and from the looks of it, AMD may very well go bankrupt within a year or two - I'd worry about that more than truly-async vs pseudo-async compute ).
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Old 6th September 2015, 18:58   #14  |  Link
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The problem for Nvidia is that Async Compute is not just a "feature"

Nvidia has to redesign the whole GPU architecture in order to support it.
It has to change fundamentally the way that their GPUs work.

There is a chance that not even Pascal, their next generation GPU will support that "feature" in the degree that AMD does.

That's a good thing because AMD sells cards to consoles, that's why changed to GCN architecture and low-level API support, but has less than 20% of discrete cards in PC market.

Time to rise that percentage
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Old 6th September 2015, 19:05   #15  |  Link
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But in order to not go off - topic, Nvidia first has to change its attitude against its rival AMD, developers, reviewers and eventually customers and potential customers.

Nvidia must stop telling SO MUCH LIES and treats everyone like their own pets.

It must stop cheating in benchmarks, accusing the others for doing that and stop forcing developers to support their products only, like it is the only IHV in graphics cards.

DX12 proved that the other company - AMD - has faster and better products regarding value-for-money than the greedy Nvidia.
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Old 6th September 2015, 19:40   #16  |  Link
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One of the Oxide developers, Kollock, has posted a few more information. He now says that NVIDIA is not done with Async Compute support in their drivers yet, and they (Oxide) are working with NVIDIA to get the driver part of that done, before its properly enabled in the driver.
Until a driver actually enables that feature properly, everything else is just speculation. Today, it cannot use the Async Warp Schedulers on the Maxwell GPU - but if the driver support is finished, the picture may be quite different.

Software scheduling may be less efficient than full hardware, but its not "no support", and until we see how the end result looks, i'll keep an open mind, in any case.

Summary here:
http://www.guru3d.com/news-story/nvi...r-support.html
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Old 6th September 2015, 19:59   #17  |  Link
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Yes, after the "outing" in a world scale, Nvidia has started to act like it understands the situation, more "normally", accepting the facts.

But in the beginning Nvidia accused the developers that they made specific optimizations for AMD and not Nvidia.

The truth is this:

The developer tried to enable a feature exposed by the driver of Nvidia - Async Compute - and as he describes the situation he saw Dante's hell or the signs of Apocalypse.

He told Nvidia what happened and they replied "don't use that feature" although was clearly exposed by the driver.

He did that for Nvidia but of course he couldn't/ shouldn't do the same thing for AMD because AMD supports it properly as a basic performance feature of DX12.

And suddenly after the low results of Nvidia and the high results of AMD, Nvidia accused the developer of biased code because he used a DX12 feature that Nvidia CAN'T use due to its architecture and AMD CAN use due to its own architecture.

Nvidia lied:

1) In their drivers and their product marketing and the specifications and the potential customers that they can do Async Compute right here, right now.

They probably thought that nobody would use it, right here right now so nobody would discover the fraud.

2) To the developer that it's OK to not use that feature but then it accused him for biased code, because he didn't use that nonexistent feature.

and

3) Is totally responsible if after the 4GB memory - gate and that fake Async Compute feature enabled in the drivers, people starts to believe that their products are different, with lower performance than advertised.

As I read in various forums and sites there is a wave of buyers of Nvidia cards asking for the money back, because of the lack of that feature which gives a HUGE performance boost to GCN AMD cards and they thought they would get it too.
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Old 6th September 2015, 20:00   #18  |  Link
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Until a driver actually enables that feature properly, everything else is just speculation.
That was the problem: The nvidia driver reported the async compute capability but when oxide enabled that feature then the performance was worse.


Apart from that Nvidia has a long history lying to their customers, but their sales shows: Customers are very forgetful or dont care.

2015: incorrect informations about directx 12 feature levels of maxwell
2015: GTX970 ... you know it
2012: incorrect informations about directx 11.1 capability of kepler chips
2011: incorrect informations about tegra 3 performance
2010: fermi wood dummy
2008: lots of bricked laptops with G84 und G86 chips
2001: incorrect informations in a comparisation geforce 2/3 with kyro II

- sabotages the performance of competitors with gameworks software (eg. disable physics hardware support if secondary AMD card is detected)
- selling expensive g-sync modules to display manufacturers which mostly act as drm blackbox
- were the first who introduced excessive rebranding (8800GT/2007 -> 9600GSO/2008 -> GTS150/2009 -> GTS240/2009 -> GT330/2010)
- driver cheating in some 3d benchmarks

But I am not forgetful in this respect, and try to avoid buying products from such companies.

*Dont ask me for sources of these allegations, google show all this with a few clicks.
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Old 7th September 2015, 08:40   #19  |  Link
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Quote:
Originally Posted by NikosD View Post
But in order to not go off - topic,
*snort*

Quote:
Originally Posted by jones1913 View Post
Apart from that Nvidia has a long history lying to their customers, but their sales shows: Customers are very forgetful or dont care.
Although they've pulled some shenanigans, like everyone else, I still think most of it is just their developers (hardware and software) being wildly over-optimistic about what they can do, and not testing nearly enough. In fact, "We don't test" should be the motto of all the big GPU makers, right after "We don't listen to you." But AAA games still sell, and performance and capabilities do improve, so I guess that's something.
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Old 9th September 2015, 09:52   #20  |  Link
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Anyway i'm forced to buy NVidia as AMD ignoring completely video - NVENC can't be compared to AMD solution...
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