Download and play the 1080p Coral Reef and Terminator 2 Clips.
quote:
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System Requirements
Although other system configurations may be able to playback this content, for an optimal experience we recommend systems of at least a 2.53 GHz Intel or AMD Athlon XP 2200+ or higher processor for 720p and 3.0GHz or greater processor for 1080p. For either scenario, an AGP4x based NVIDIA or ATI video adapter card with at least 32 MB of RAM and the most recent OEM driver updates is recommended.
The higher the data rate (in Mbps), the higher the resource requirement. For optimal playback of 1080p content, an AGP8x 128MB video card is required.
here
The download speed on this site is pretty insane as well, so a good way to test both connection and overall system speed.
I got a stable 700KB/sec+ on a 90Meg file. Not bad.