[mythtvnz] PCI 512M 8400 G98 or PCI 9400??

[Nick Rout]

On Tue, Apr 21, 2009 at 12:24 PM, Steve Hodge <stevehodge at gmail.com> wrote:
> On Tue, Apr 21, 2009 at 12:08 AM, Tortise <tortise at paradise.net.nz> wrote:
>>
>> Again Jean-Yves
>> Much obliged to you, thank you.
>> (Makes a bit of a mockery of AGP and PCI-16 doesn't it?!)
>
> Hardly. The fact that encoded video doesn't stress the PCI bus in no way
> implies that the PCI bus is as capable of all video card uses. There seems
> to be a bit of a perception around that HD video is always very bandwidth
> intensive. It's not, unless it's uncompressed.

Exactly

As far as bus bandwidth goes, bluray disk movies have a max bitrate of
54Mbits/sec (http://en.wikipedia.org/wiki/Bluray). Most HiDef stuff
you get will have a lower rate.

PCI has a max rate of 133MBytes/sec (http://en.wikipedia.org/wiki/PCI_Local_Bus)

There is plenty of room to push the compressed video stream over PCI
to the graphics card, by a factor of about 24!