DVB-T usage on an 'average PC'
See the difference between the HD TV3 feed (nearly going 100% CPU) and the SD C4 feed. TV3 looks by no means perfect, but it's not overly stuttery.
PC Spec:
Core 2 Duo E6300
Hauppauge HVR900
Radeon 9600XT 256MB
Software:
MediaPortal SVN Build 2008-03-26
Windows XP SP2
Using FFDShow video filter (build rev1920_20080328_sse)
Author's note by allstarnz, on 1-Apr-2008 20:19 , user id: 12074)
sbiddle - fair point and I totally agree. Was merely pointing out that it is possible without a brand new video card etc. I probably will upgrade either that or my main PC (that has a 7300GS) in due course, but right now I have other financial priorities 
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Comment by sbiddle, on 1-Apr-2008 19:48 , user id: 1387)
That is why a video card with H.264 acceleration is essential for DVB-T in New Zealand. Using PowerDVD Ultra's H.264 codec with hardware acceleration with a supported video card and that will drop down to around 5% - 10% CPU usage on all channels.