[mythtv-users] OT: Recommendation on Nvidia Card

Brian Wood beww at beww.org
Wed Sep 2 16:35:39 UTC 2009


On Wednesday 02 September 2009 10:23:45 Jim Stichnoth wrote:
> On Wed, Sep 2, 2009 at 8:55 AM, Daniel Kristjansson<danielk at cuymedia.net> 
wrote:
> > The 5200 is not a bad card if you are just using it for the YUV->RGB
> > conversion. But I don't know how well the PCI version would handle
> > HDTV, the AGP version handles it.
>
> Some time ago, I tried a PCI version of an 8400 card, without VDPAU,
> on a 1366x768 at 60Hz display.  The results were disastrous, with lots of
> stuttering and a formidable CPU maxed out.  If you do the
> calculations, it appears that the PCI bus bandwidth needed for sending
> the bits to the card was a lot more than the maximum.  The card did
> just fine with VDPAU, as well as for an SD-resolution display.

That seems to be the general experience.

Remember many things are contending for the PCI bus in addition to video 
(though that's certainly a large portion of it). Many motherboards do not 
have the greatest implementation of PCI.

Adjusting latencies might help, but I think in general it's not a good idea to 
try and push uncompressed HD video across a PCI bus.

-- 
Brian Wood
beww at beww.org


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