AMD Radeon GPUs Limit HDR Color Depth to 8bpc Over HDMI 2.0

[Aquinus]

To be fair they are correct. This thread shouldn't exist because it makes TPU look either nvidia biased or just flat out wrong. Neither of those options is good in my book.

Exactly. The title shouldn't be: AMD Radeon GPUs Limit HDR Color Depth to 8bpc Over HDMI 2.0
It should be: HDMI 2.0 has insufficient bandwidth to drive HDR with more than 8bpc

It's a misleading title that makes it sound like AMD gimped their GPUs when HDMI 2.0 just sucks compared to DP.

This feels a lot like 8GB of VRAM being a con in reviews until nVidia did it with an equivalent GPU. I love TPU but, this kind of bullshit is growing concerning.

Or closing of this thread...

Or maybe @btarunr should be scolded for making an article that so damn misleading. Pointing a finger at AMD when it should be pointed at HDMI and the HDMI Forum. I expect better out of TPU and crap like this is WCCFTech worthy.

 

[bug]

Speaking of (pardon the expression) wccftech, does anyone know how to keep it out of Google Now newsfeed? I keep "clicking" "Not interested in stories from wccftech", but they keep coming still.

 

[cdawall]

and yet there's no correction/retraction on the front page

You are correct here let's tag someone who can do something about it. @W1zzard

 

[Aquinus]

You are correct here let's tag someone who can do something about it. @W1zzard

I think they would just prefer that everyone be quiet about it so they don't have to say anything. Maybe @W1zzard needs another bump?

 

[eidairaman1]

yeah this is too biased when it affects both companies

 

[Aquinus]

yeah this is too biased when it affects both companies

Isn't posting FUD against the forum guidelines? Maybe everyone should be reporting the news post and calling it out for what it is...

 

[prtskg]

Isn't posting FUD against the forum guidelines? Maybe everyone should be reporting the news post and calling it out for what it is...

Just did it.

 

[nemesis.ie]

Yes, we can all report it via the link in the first post. I just did too.

 

[heky]

So did i...

 

[David Fallaha]

This is weird, because HDMI 2.0 offers the same bandwidth as DP 1.2. Probably a bug in the drivers?

er no, DP1.2 doesn't do HDR and 1.3/1.4 have far more bandwidth

German tech publication Heise.de discovered that AMD Radeon GPUs render HDR games (games that take advantage of new-generation hardware HDR, such as "Shadow Warrior 2") at a reduced color depth of 8 bits per cell (16.7 million colors), or 32-bit; if your display (eg: 4K HDR-ready TV) is connected over HDMI 2.0 and not DisplayPort 1.2 (and above). The desired 10 bits per cell (1.07 billion colors) palette is available only when your HDR display runs over DisplayPort. This could be a problem, since most HDR-ready displays these days are TVs. Heise.de observes that AMD GPUs reduce output sampling from the desired Full YCrBr 4: 4: 4 color scanning to 4: 2: 2 or 4: 2: 0 (color-sub-sampling / chroma sub-sampling), when the display is connected over HDMI 2.0. The publication also suspects that the limitation is prevalent on all AMD "Polaris" GPUs, including the ones that drive game consoles such as the PS4 Pro.

Source: Heise.de

LOL your post is completely wrong/nonsensical -you do realise that 4:2:0 can be 10bit or 8bit right?

also AMD is doing 8bit 4:4:4 on PC and 10bit 4:2:0 on console -these are the limits of HDMI2.0...plus no one wants to look at a desktop with 4:2:0 subsampling...

 

[Tatty_Two]

er no, DP1.2 doesn't do HDR and 1.3/1.4 have far more bandwidth



LOL your post is completely wrong/nonsensical -you do realise that 4:2:0 can be 10bit or 8bit right?

also AMD is doing 8bit 4:4:4 on PC and 10bit 4:2:0 on console -these are the limits of HDMI2.0...plus no one wants to look at a desktop with 4:2:0 subsampling...

It is not his post, it is a news piece sourced from another site with link, he is sharing with the community what other sites are saying.... right or wrong, good or bad, FUD or not, whether anyone thinks it's right or wrong to post such news sources is another story of course.

 

[Aquinus]

It is not his post, it is a news piece sourced from another site with link, he is sharing with the community what other sites are saying.... right or wrong, good or bad, FUD or not, whether anyone thinks it's right or wrong to post such news sources is another story of course.

This isn't freaking WCCFTech, like any good journalist, check your freaking sources and accurately summarize it. Check the quality of the news before posting it or at least make sure that the claims are legitimate and that they're being summarized properly. Even the article itself says that this is an HDMI 2.0 limitation and that nVidia refused to comment on whether their GPUs do the same thing... but when you read the "summary" here, it speaks like AMD is at fault. No mention that this isn't an AMD-specific issue and that it's all HDMI 2.0.

When your summary says stuff like:

The publication also suspects that the limitation is prevalent on all AMD "Polaris" GPUs, including the ones that drive game consoles such as the PS4 Pro.

You're taking the article out of context.

When the article says (after translation,):

HDMI 2.0a provides insufficient in contrast to DisplayPort 1.4 bandwidth to 4K HDR images with 10-bit, 60 Hz and Full YCrBr 4: 4: 4 color scanning. Although AMD could set the HDR color depth to 10 bits, but then would have to reduce the sampling to 4: 2: 2 or 4: 2: 0 (color subsampling / chroma subsampling). This can result in filigreed details or fonts, which could interfere with the display of life in the head-up display. Just a few months ago, AMD told journalists that using Polaris graphics cards via HDMI 2.0 would drive 10-bit HDR displays with color sub-scanning 4: 2: 2. Possibly, the at least continues to play when playing UHD-HDR movies.

That's not a problem with AMD cards, that's an issue with anything using HDMI 2.0 and even the article acknowledges that but, not the summary here. In fact, nothing in the article says that they suspect this is an AMD problem so I'm baffled that the summary here would jump to that kind of conclusion.

Either way, the way the article was represented was distasteful and misleading. When your own guidelines say to not post FUD but when you say:

It is not his post, it is a news piece sourced from another site with link, he is sharing with the community what other sites are saying.... right or wrong, good or bad, FUD or not, whether anyone thinks it's right or wrong to post such news sources is another story of course.

If members are held to different standards than people posting "news," then you have a problem.

 

[FordGT90Concept]

The original post needs an editorial update stating it is factually incorrect and an explanation of why; this is required for journalistic integrity. This news post is generating negative publicity for TechPowerUp.

 

[Aquinus]

The original post needs an editorial update stating the source is factually incorrect and an explanation of why. This is required for journalistic integrity. TechPowerUp doesn't look good when this article is getting flagged by other publications for spreading falsehoods.

If you read the article after translating it, it states very clearly that this is an HDMI 2.0 limitation, that AMD said they were going to do this, and that nVidia hasn't commented on if their GPUs do the same thing however, the summarized version here leaves a lot of that out and actively makes it sound like AMD gimped their GPUs. The summary is more inaccurate than the article which pisses me off more. It's like grabbing FUD, sharing it, then supercharging it with your own rhetoric.

 

[prtskg]

It is not his post, it is a news piece sourced from another site with link, he is sharing with the community what other sites are saying.... right or wrong, good or bad, FUD or not, whether anyone thinks it's right or wrong to post such news sources is another story of course.

I realise my mistake now. I was thinking highlighted parts are important.

 

[Tatty_Two]

All my point is, arguably he is reporting other sources inaccuracies, I find it amusing that some think it's Bias against AMD, especially when it is sourced from another site AND when the piece was released onto the front page it sat next to an article about how great Zen 8 core performance was, I would agree wholeheartedly if it was an editorial but its not.

 

[Aquinus]

All my point is, arguably he is reporting other sources inaccuracies, I find it amusing that some think it's Bias against AMD, especially when it is sourced from another site AND when the piece was released onto the front page it sat next to an article about how great Zen 8 core performance was, I would agree wholeheartedly if it was an editorial but its not.

Intentions don't really impact whether it's FUD or not. FUD is FUD. How the article was cherry picked and summarized, along with a nice deceiving title, doesn't help.

The truth of the matter is that this problem has nothing to do with AMD and everything to do with HDMI.

 

[FordGT90Concept]

...and corrections have not been made.

 

[Tatty_Two]

Well I cannot answer for my news colleagues of course, I am sure they will be along shortly to read the feedback and reports.

 

[chr0nos]

And still no changes since 26/Nov.

Seems like they just dont care.

 

[Tatty_Two]

And still no changes since 26/Nov.

Seems like they just dont care.

Well to be fair they don't have to, it's their choice, I didn't think they would change the wording of the article in any case, the article is not theirs and if they quote a source then they cannot change that, however if we for example wrote our own headline for the news piece here then that would be different.

 

[nemesis.ie]

Well to be fair they don't have to, it's their choice, I didn't think they would change the wording of the article in any case, the article is not theirs and if they quote a source then they cannot change that, however if we for example wrote our own headline for the news piece here then that would be different.

To be fair they should at least add in that the original article says that nVidia may also be (and as we know actually are) affected by this. It's blatantly cherry-picked information from the original and poor journalism (IMO anyway) to just lift/paste things directly without thinking about it, fact checking and presenting an unbiased view.

 

[EarthDog]

Well I cannot answer for my news colleagues of course, I am sure they will be along shortly to read the feedback and reports.

And if they did, it would be nice to hear where they were coming from, particularly if it isn't going to be corrected.... its been over 2 weeks since your post... but even more since it was corrected in the thread. At least another article correcting the previous report I still believe is in order.

A little communication goes a long way in situations like this.

 

[cdawall]

Simple feedback, this post is wrong, it's a simple mistake based off of a biased source. TPU should either dump the post or correct it.

 

[Tatty_Two]

I appreciate all of your points, there were plenty of reports, I can only assume that our news people took a look and made a decision, if you feel strongly enough maybe drop them a PM, we have a policy that only News Editor's (or possibly W1z too) change/amend/delete or add to news article's.