[mythtv-users] [ATrpms-users] Confused: why did video performance DECREASE (up to 70%) after upgrading video card by 2 generations??? Please validate my analysis

[Jeffrey J. Kosowsky]

Steve Hodge wrote at about 15:04:57 +1300 on Tuesday, December 9, 2008:
 > On Mon, Dec 8, 2008 at 5:39 PM, Jeffrey J. Kosowsky <
 > mythtv-users at kosowsky.org> wrote:
 > >
 > > the picture looks good except
 > > for the fact that it is a tad "slow" causing it to get behind the
 > > audio and then for the audio to pause noticeably every second or so
 > > while it waits for video to catch up.
 > >
 > 
 > What have you got selected (or tried selecting) on the first page of
 > Setup->TV Settings->Playback? In particular have you tried these ones:
 > Enable realtime priority threads
 > Extra audio buffering
 > Use video as timebase
 > Enable OpenGL vertical sync for timing
 > 
 > I have these all set except "Use video as timebase".

Yes - that is exactly my setup -- though I tried the other
permutations just in case ;)

What's really confusing me is that I can't even get SD digital working
though that gives me good hope that this is not a hardware problem
since SD should not be that challenging...