Follow up on poor video quality
Now that we all understand how the speed test works, and hopefully agree it has nothing to do with how fast you actually stream video, lets tackle the thread that piconut2 just posted.
piconut2 has a dell computer and Samsung connected to the same TV and sees HD on the PC but Lousy D on the Samsung.
I had my Roku and Samsung connected to two Identical Samsung HD LCD's watching the same HD movie. Initially, I saw the same problem where Roku was in HD and Samsung was not. After I manually configured the Samsung to always display 1080i, streaming HD worked without exception. If I let the box select video output quality automatically, it rarely (like 1 time in a hundred) would display HD. Manually selecting 1080i or 1080p seemed to fix the problem.
Here is the other thing I found, the IP address the Roku box was streaming video from was not the same as the Samsung box. I did not think to try my PC, but I bet it would stream from yet another IP address.
Remember, you need at least 4.8mbs that your Samsung can gobble up all to itself to maintain HD streaming to Netflix. If you change the Samsung setting as described, and have at least a 5mb DSL (Cable company's are a whole 'nuther discussion) and still can't stream HD. Make sure you have turned off any other computers, or wireless routers etc. that are connected to your network and try again. Still got problems? Try streaming the same movie at 5am (yes morning) with everything shut off. The video servers are least busy early in the morning.
I have 15mb DSL from the local phone company, 2 Samsung Blue Ray DVD's, Roku box, Vudu box, Zillion box, and they all perform equally well every time. I also have no port restrictions on my modem, firewall is done at the PC level.
One other thing to verify, do a Speak Easy Speed test to the server that is farthest from you. Whatever that number is will be the approximate speed you can rely on to the video server. So, you may hit 10mbs on a test to a server close to you, but far away you may hit only 4mbs... 4 mbs is probably all you will get to the video server, and it takes 4.8mbs to stream Netflix in HD.
I hope all this helps!
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