Get your hands on some 1080p video. That should really stress your system. I can currently play 720p video without any stutter or loss of frames (all thanks to PureVideo with my 6600GT
HD-WMV Hardware Acceleration!). Even with PureVideo though my CPU goes up to 90%. I have a...
AMD Athlon 1.6GHz 200MHz FSB (Socket A)
1GB RAM (forget the speed)
10GB HDD (I had a 160GB drive on it...but its on my FileServer now)
XFX 6600GT AGP
Yeah..I know it sucks..lol..point is, I can play 720p video on a bad setup with Hardware Acceleration by using the Video Card to decode the HD video instead of the CPU. Unfortunatley Hardware Acceleration cannot perform miracles...I can't play 1080p video
...I was expecting that much though..I'm happy that I can even play 720p.
Heres where i've been getting test video from...
HD-WMV Showcase
I currently have my 6600GT connected to my Monitor and the secondary DVI connection to my 27" HDTV (in my room)....Nothing like watching HD content on my HDTV
...I just finished watching a couple of Xbox360 trailers (720p)....so pretty.