Problems when running MP on secondary display (1 Viewer)

[seco]

I'm using Mediaportal's screen selector feature to start MP in fullscreen mode on my secondary display which is 42" Mirai LCD TV.

I've ran into two problems with this setup:

1. Stuttering: TV and video (for example .mkv files) stutter about 3-4 second interval, pause is very quick but it is disturbing. Stuttering is clearly visible if I set DirectX exclusive mode OFF: Every time the picture stutters, tearing occurs. I've tried several x264 and mpeg2 decoders.

2. Artifacts in picture: Blinking bright green artifact (one pixel wide, two pixels high) in the middle of the screen, sometimes another in top-middle of the screen. Artifact(s) is/are not blinking always, but quite often. If I set DirectX exclusive mode OFF this problem is gone, but then I get tearing. And no, these are not dead pixels, because my TV actually has one and it's nothing like same

And finally: If I configure MP to start on my primary display which is Viewsonic 22" TFT both problems are GONE. If I play video files directly with Mediaplayer Classic on my primary or secondary display, no problems at all.

Another weird thing is that sometimes the log file says "Main: DX exclusive mode: False" even if I've enabled it in configuration file.

TV-Server Version: SVN 16125
MediaPortal Version: SVN 16125
MediaPortal Skin: XFace 1.0
Windows Version: Windows XP 32bit Pro SP2
CPU Type: AMD X2 4600+
HDD: Samsung T166 500GB + Seagate 320GB
Memory: 2GB Corsair
Motherboard: Asus M2N-E
Motherboard Chipset: nForce 570
Motherboard Bios: Latest
Video Card: Geforce 7900 GT
Video Card Driver: Forceware 93.71
Sound Card: Soundblaster Audigy ZS 2
Sound Card AC3: Passthrough AC3Filter
Sound Card Driver:
1. TV Card: FireDTV
1. TV Card Type: DVB-C
1. TV Card Driver: Latest BDA
MPEG2 Video Codec: nVidia Purevideo
Remote: FireDTV Remote
TV: Mirai FullHD LCD 42"
TV - HTPC Connection: HDMI-DVI

I was wondering, does anyone know if it is possible to add secondary PCI-E graphic card to non-SLI motherboard, in this case my Asus M2N-E?

And in this way could I "dedicate" secondary card to Mediaportal...

 

[seco]

Ok, I found one solution for the 1. stuttering problem: I installed DScaler5 MPEG codecs and changed Mediaportal to use DScaler as a MPEG2 encoder instead of nVidia Purevideo and voila: stuttering is gone.

BUT, now the audio is way out of sync and the picture quality is poor compared to Purevideo.

Any ideas?