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<blockquote data-quote="Tech Geek" data-source="post: 38013" data-attributes="member: 18181"><p>Ok, the first card you linked to on the Newegg site.... 128 bit but memory clock of 1120MHz. All I noticed was the 128 bit and core clock of 500MHz. Oops... my bad. But some specs are different on the 2nd link.</p><p></p><p>If a 9700PRO doesn't work I'd say it's a DDR clock speed issue. That has DDR 400 if what I found is right and it's peak bandwidth rather than overall bandwidth that is the issue. Which means that 256 bit and DDR 400 may not solve the problem. Then it's a RAM clock over 625MHz.</p><p>I'd say it's actually lower and Microsoft is playing it safe. </p><p></p><p>Some people have memtioned setting the PCI latency and all sorts of things in an attempt to get this to work. I'm sure that can have an effect but I don't think it's the real problem.</p><p>It's gotta be related to decoding and buffering somehow and the fault lies with Microsoft It's not the tuner, it's not the video card... it's Microsoft.</p><p>Rather than spend a dime rewriting their code they just bump the required specs and say upgrade.</p><p></p><p>If I were to guess I'd say that instead of sending data to the card at a constant rate and using buffering to keep data ready for the card they are bursting blocks of video to the card as they arrive and if the card is still busy from the last burst it dumps the next block. Why it bothers lo-res more than hi-res I'm not sure. Perhaps block size or receive buffer size have something to do with it. Lo-res may have larger block lengths (in frames) so more frames are dropped when the card is found to be busy. That would be much jerkier than hi-res that would drop a few frames here and there.</p></blockquote><p></p>
[QUOTE="Tech Geek, post: 38013, member: 18181"] Ok, the first card you linked to on the Newegg site.... 128 bit but memory clock of 1120MHz. All I noticed was the 128 bit and core clock of 500MHz. Oops... my bad. But some specs are different on the 2nd link. If a 9700PRO doesn't work I'd say it's a DDR clock speed issue. That has DDR 400 if what I found is right and it's peak bandwidth rather than overall bandwidth that is the issue. Which means that 256 bit and DDR 400 may not solve the problem. Then it's a RAM clock over 625MHz. I'd say it's actually lower and Microsoft is playing it safe. Some people have memtioned setting the PCI latency and all sorts of things in an attempt to get this to work. I'm sure that can have an effect but I don't think it's the real problem. It's gotta be related to decoding and buffering somehow and the fault lies with Microsoft It's not the tuner, it's not the video card... it's Microsoft. Rather than spend a dime rewriting their code they just bump the required specs and say upgrade. If I were to guess I'd say that instead of sending data to the card at a constant rate and using buffering to keep data ready for the card they are bursting blocks of video to the card as they arrive and if the card is still busy from the last burst it dumps the next block. Why it bothers lo-res more than hi-res I'm not sure. Perhaps block size or receive buffer size have something to do with it. Lo-res may have larger block lengths (in frames) so more frames are dropped when the card is found to be busy. That would be much jerkier than hi-res that would drop a few frames here and there. [/QUOTE]
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