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Message: <blockquote data-quote="Tech Geek" data-source="post: 148659" data-attributes="member: 18181">Hijacking a thread I started... hmmm... interesting.Is it good manners to come into a thread without actually reading it and accuse the person that started it of hijacking it?BTW, I had posted almost exactly what I did in the last post within 5 posts before it.  And if you read the entire thread you'll probably find "it works on my <insert low end card> at 1080i/p" other times as well.Try searching on ATSC HDTV.  There was another thread on the topic and I believe several cards and this issue with lower resolution sources was discussed.  The board has been reorganized since I last looked at it so I'm not sure where it's at anymore.  I think it was originally under "hardware" but where that is now I'm not sure.Like I said, it's probably a DX9 issue and if you look I didn't list resolution as the cause.  If I were pinned down as to the cause I'd say it's scaling the image in a 3D mode where 3D speed & memory bandwidth are the issue.  However I'm not sure exactly what the minimum combination is.I *can* say that very high MHz 128bit or 256bit memory busses seem to be common on cards that do work.  High 3D rendering speeds also seem to be common on the same cards so it's difficult to distinguish which is a bigger factor.Part of the reason I'm trying these two cards is to finally make my system work with HDTV and to see if we can help come up with a baseline for chipsets or memory speed.Knowing your card works with 1080i/p video doesn't really tell us much just because even low end cards seem to handle it since it is less taxing on the hardware. What we really need is a standard set of video clips people can download and then have people submit how a specific card from a specific manufacturer performs when playing each clip.  Once we get enough results to start making some real comparisons... then we can say this or that chipset, memory speed, buss width and CPU speed works with HDTV. Then we need to nail down requirements for H.264, Blue Ray, HD-DVD... does ATSC require more/less speed than DVB-T/S???  You get the idea.But until we have a known set of video clips to base results on... we are still guessing a little.If I can get some problem clips recorded I may put up a couple torrents for people to grab and see if they work.Your X600 is a midrange card and it may be fast enough or it may depend on which model you have.  The X1300 I tried is quiet but it's the slowest X1300 made.  If the X1650 works... your X600 has pretty good odds of working with all sources.  I have no doubts about the X1950GT working and I bought it as a fallback in case the X1650 falls short of expectations.</blockquote>

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