[Open-graphics] AGP, PCI or PCI-express

[Lourens Veen]

On Monday 21 August 2006 10:17, Dieter wrote:
>
> Very few machines that the OGC would go into have PCI-X.  So you only
> get "plain" PCI.  And you have to share that 133 MBps with the other
> PCI devices.  And lots of machines have other important
> high-bandwidth devices on the PCI bus.
>
> That's fine for mostly static things like most desktop apps.  Email,
> spreadsheet, image viewer, most web browser use, ...
>
> But many (most?) users are going to want to be able to watch video.
> OGC is supposed to support 2 dual-link displays.  Last I read,
> OGC is not going to have an mpeg decoder, and even the hw scaler has
> been dropped.  Even if the CPU is fast enough (most will not be), and
> even if you give 100% of the PCI bus to the OGC (not realistic), and
> only driving 1 display, the bits just don't fit.

We can use the drawing engine to do hardware scaling, and there will be 
colourspace conversion. That is, we'll have hardware support for 
XVideo. Most of the consumer cards in use today don't offer more than 
that, and it works just fine here watching DVDs (Athlon XP 1700+, 
Radeon VE QY 32MB AGP).

Lourens
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