** This is not the board you posted but a low power ITX with the same chipset. ****
I'm using the 945gc chipset for an MD and it is running with no problems. RGB, 720p, connected to a visio 32" LCD 720 native res.
Its the Shuttle KPC for $99. running a celeron 430. 2 GIG ram.
mythtv is about 75% cpu load
DVD(mpeg2) is about 8% cpu load
xvid and 264 coded video runs around 25% cpu load
** Only been testing for a few days.