Is your connection actually 768 kbps (standard DSL)?
If so, I am somewhat puzzled. I have verified numerous times that I have been provisioned the full bandwidth (actually a little more), yet can not view any similar HD video without buffering pauses every 10 or 15 seconds (at most).
I run state-of-the-art custom router software (DD-WRT), have various flavors of Linux and Windows laptops, desktop and Goggle TV with the latest 3.1 Android update. Within the LAN there is no problem, naturally, serving and viewing HD.
In past threads right here on FR other standard DSL users have agreed with me the HD content was not watchable and it is consistent with everything else I know about the capabilities of the link.
If I am getting HD, I am not aware. I am totally tech-illiterate.
I _can_ surf and post to FR while GBTV or any Roku stream is also playing. But we cannot download any other video on the computers while we are streaming. Our TV is an old *flat screen), just meaning the front of the tube is flat, not curved. We had problems with the original Roku, but not w/Roku II. Our modem is whatever the ISP is renting to us. It was just replaced/upgraded last summer. The old one got hot. It says: SAGEMCOM SE567. We are wired/cabled to the Roku, not wireless. When people are heavily on the internet in our area, we occasionally get knocked off and it has to reload. This happens more w/GBTV than w/Netflix, though, and more at 5pm Central than later on if I replay.
All I know is that it works and we are fine w/it.