Paul was this a discrete video card I take it?  My experience has been that you can get noise picked up in the card before the AD/DA step by picking up interference from the video card itself, especially if the two are placed right near each other in the computer, however if you are careful about placement you are usually fine(For instance my RME HDSP9632 is currently fine in my new box, because my video card is a fair amount away from it, but in a previous box these same two cards were much closer together(Initially right next to each otehr till I realized what was happening) and interference would happen.

    Seablade

On Fri, Jan 6, 2012 at 7:05 PM, Paul Davis <paul@linuxaudiosystems.com> wrote:
On Fri, Jan 6, 2012 at 6:20 PM, Clemens Ladisch <clemens@ladisch.de> wrote:

> I don't think this is a problem in practice.  I've never heard of actual
> noise problems of PCI audio interfaces; all the reports I did hear were
> from cheap USB devices that picked up noise from the computer's power
> lines.

i've had video interfaces interfere with an in-the-box PCI device.
scrolling in emacs would cause white noise in my speakers :) yes,
really.
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