Ivy Bridge 23.976fps fixed?

[zoob]

Hi All,

Haven't seen any posts about this recently...

Can anybody with an IVB processor and a Z77 motherboard confirm if the 23.976 fps issue has been resolved?

With SB & Z68 it got pretty close to the correct frame rate by disabling UAC in Win7.

Thanks

 

[Don Karnage]

What 23.976fps issue?

 

[dma0991]

Not quite but it isn't that noticeable either to the untrained eye. Without DXVA, I'm getting less consistent values to 23.976fps but with DXVA enabled to my HD4650, it is far more consistent. This is tested with a Core i5 3570K. From what I know, the issue isn't 100% fixed but it is lessened by a fair margin from SB to IB.

 

[Fjodor2001]

According to the Anandtech "HTPC review" of Ivy Bridge it should be solved (with a coming BIOS update). See:

http://www.anandtech.com/show/5773/intels-ivy-bridge-an-htpc-perspective/5

Where the following is stated:

"One of the main reasons for HTPC purists to override the Intel integrated GPUs was the lack of a proper 23.976 Hz refresh rate.
[...]
How does Ivy Bridge fare? The short story is that the behaviour on the P8H77-M Pro board is very similar to Sandy Bridge. As the screenshot below shows, the refresh rate is quite stable around 23.973 Hz.
[...]
The good news is that Intel is claiming that this issue is fully resolved in the latest production BIOS on their motherboard. This means that BIOS updates to the current boards from other manufacturers should also get the fix."

So apparently with a BIOS update the 23.976 Hz video output issue should be solved in Ivy Bridge. But it is yet to be confirmed that this actually is the case. Is there anyone with access to the latest BIOS that can confirm if the issue indeed is fixed?

 

[pauldun170]

I'm glad I'm not a purist.
Never noticed it on my HTPC
Guess my setup isn't fancy enough

 

[gevorg]

I'm glad I'm not a purist.
Never noticed it on my HTPC
Guess my setup isn't fancy enough

In my experience with Sandy Bridge, it really depends on your TV and how it reacts to the "imperfect" signal. The TV's built-in processing, scaling and settings can make a difference. On a 2006 Pioneer plasma, I barely notice it, while on a 2010 Sony LCD I can't stand it.

 

[pauldun170]

In my experience with Sandy Bridge, it really depends on your TV and how it reacts to the "imperfect" signal. The TV's built-in processing, scaling and settings can make a difference. On a 2006 Pioneer plasma, I barely notice it, while on a 2010 Sony LCD I can't stand it.

I cant even remember the conditions to reproduce it. Also I have since popped an HD4830 in there so I can't even double check now.

 

[Fjodor2001]

In my experience with Sandy Bridge, it really depends on your TV and how it reacts to the "imperfect" signal. The TV's built-in processing, scaling and settings can make a difference. On a 2006 Pioneer plasma, I barely notice it, while on a 2010 Sony LCD I can't stand it.

The reason may be that the 2006 Pioneer doesn't support 23.976 Hz video. Most TVs in 2006 didn't. That only started to become common in TVs around 2007-2008. It was actually a "feature" which was used to promote these newer TV sets back then. For example Sony calls it "24p True Cinema". See e.g. http://www.avsforum.com/avs-vb/showthread.php?t=1027018 .

So possibly your Pioneer TV from 2006 doesn't try to sync at 23.976 Hz and that's the reason why you don't notice that the Sandy Bridge does not provide a signal at exactly that frequency.

 

[toyota]

What 23.976fps issue?

lol, come on now you know what to do...

https://www.google.com/search?sourc....,cf.osb&fp=6dfe335ccc53cf22&biw=1920&bih=989

 

[jacktesterson]

Before I added the 4850 (got it for $20 local), I was using the HD2000 occasionally on my 2007 model Plasma 1080p TV, and daily on my 2010 model 37" LG 1080p LCD (and still uses this tv now, only now using the 4850)

Never noticed it at all.

Damn my TV is over 5 yrs old (Got it in January 2007) and I still love it. Waiting to OLED becomes reasonable and available.

I paid over $3000 for my Plasma in 2007.

 

[jacktesterson]

http://forums.anandtech.com/showthread.php?t=2198726

may help you.

 

[Fjodor2001]

Before I added the 4850 (got it for $20 local), I was using the HD2000 occasionally on my 2007 model Plasma 1080p TV, and daily on my 2010 model 37" LG 1080p LCD (and still uses this tv now, only now using the 4850)

Never noticed it at all.

But is the video output of your computer set to 23.976 Hz? And are you sure your TV syncs at that frequency?

Otherwise it is of course not surprising that you do not notice any 23.976 Hz related problem...

Many people set the video output of their computer to 60 Hz and then still act surprised that they never notice any 23.976 Hz related problem. And also notice that just because you are playing 23.976 Hz movies doesn't mean that the video output of your computer will be set to that frequency. In most cases the computers are configured to use 60 Hz regardless of what content is played, and then the computer converts the frequency used for the video that is played to the video frequency used for the video output (e.g. 23.976 Hz -> 60 Hz (or 59.94 Hz)) using for example 3:2 pulldown. Then the TV will sync at 60 Hz and you'll of course never notice any 23.976 Hz problem.

However converting from 23.976 Hz -> 60 Hz has other negative effects. That's why videophiles want 23.976 Hz across the complete video chain without any conversion.