Digital satellite is already mpeg2 encoded, so there is almost no CPU load (no encoding) when capturing. The stream goes straight to disk. There is very little difference between different DVB cards on CPU requirements.

It would be sluggish, but you would likely be able to record with this system, view EPG programming data, select programs to record, play music, etc. However, you probably would not be able to play back video recordings satisfactorily. A PVR-350 might play back the video, but the 100Euro it would cost would go a long ways towards a bare bones low-end PC that would be more than sufficient to handle SD without it.

You might want to take a look at http://www.knoppmythwiki.org/index.php? ... Components

Hauppage does have cards that support DVB-S. The PVR-250/350 do not though.