I now have HD Digital Cable from Comcast.

My question is:

Does the DVI make a real difference tranfering the signal from the Box to the screen? I am using Monster Cable 3 wire component cable. It is very good (depending on the signal), but I was wondering is the DVI will improve Comcast's picture quality to my TV?

I know overall DVI (data stays digital) is the better way to go when upconverting a DVD to an HDTV, but is Comcast's signal already compressed to the point where the DVI will not help.

In a word, yes. DVI will provide what many describe as a "cleaner" signal because analog noise is not added during conversion. IMHO, the difference falls under "The Dorito Effect".

Explanation of "The Dorito Effect" (skip unless you're really, really bored):
This is the law that says if get used to eating Dorito brand taco chips and then switch to an off brand, you'll notice a big difference in taste. The off brand being significantly inferior. However, if you begin eating off brand taco chips and do not switch to Doritos, you will more than likely be satisfied with your current, off brand choice.

Short answer: No.

Long answer:

For HD signals, you won't see any difference (unless you're using a fixed-pixel display). A RPTV sends an analog signal to the CRTs, so it doesn't stay digital all the way anyways. Even with a fixed-pixel display, the difference is slight and almost imperceptible.

For SD signals, the picture may look better. I thought SD channels looked like crap through the component cables, so I used s-video for all non-HD channels (which looked much better). Using a DVI cable allowed me to only use one connection to my TV, and freed up a component input for an OTA set-top box.

I made a similar post questioning DVI (though I use TimeWarner).

http://dvdtalk.com/forum/showthread....hreadid=375742