[mythtv-users] Asus M4N78 PRO GeForce 8300 and 1080p

Steve Malenfant smalenfant at gmail.com
Sun Mar 28 16:05:02 UTC 2010


I don't have 720p problem with my GeForce 8200 and AMD X2 4400+. Although,
1080i is a problem. It seems to work at "VDPAU Slim" but in "normal" it
skips a lot. Changing the scaling didn't help. Now I need to verify which
quality output is better, VDPAU or CPU+.

On Sat, Mar 27, 2010 at 4:00 PM, Kevin Ross <kevin at familyross.net> wrote:

> Jongi wrote:
>
>> Hi,
>>
>> I am building a secondary FE for my bedroom. However I will be going with
>> a 720p 32" LCD. I have some 1080p content on my master BE/FE which is
>> connected to a 50" Plasma. The motherboard I have on the secondary FE is
>>  Asus M4N78 PRO GeForce 8300 Motherboard. If the M3N78-VM is anything to go
>> by that board should handle 720p without issue using vdpau. However the
>> M3N78-VM I have used to struggle at times with 1080p content (I ended up
>> getting a 9500GT).
>>
>> Is there a way to have the onboard "process" the video as 720p? Will that
>> add to the load and make things worse?
>>
>> Regards
>> Jongi
>>
>
> I have two motherboards with GeForce 8200.  They work perfectly fine for
> all of the content I throw at them.  Their only limitation is they can't do
> the Advanced 2x deinterlacing.
>
> Since these motherboards use AMD CPU's, most AMD CPU's slow down the memory
> controller at the same time they slow down the CPU during idle time.  Since
> VDPAU doesn't exercise the CPU at all, it stays idle, causing the memory
> controller to stay at a slower speed, starving the GPU.  This will cause
> stuttering of 1080p videos.
>
> If this is indeed the problem you are having, then you have two choices:
>
> 1. Set the minimum CPU speed to about 1.8 GHz (or turn off CPU frequency
> scaling altogether) using the cpufreq-utils package, or
> 2. Upgrade to a CPU that doesn't do this (Athlon II or any Phenom).
>
> I did option 1 on one of my FE's and option 2 on the other.
>
> Hope this helps!
> -- Kevin
>
>
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