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<blockquote data-quote="mm1352000" data-source="post: 779806" data-attributes="member: 82144">I find it difficult to answer questions like this. Invariably we want to use the cheapest and quietest GPUs, however those same GPUs are the ones that don't always have enough grunt - it is a bit of a minefield. I can't comment for NVidia as I've only owned an old 6600GT. On the ATI side I'd say don't go below a 4670 in the 4*** series. In the 5*** series don't go below the 5450, and if you want to use it with a 30&quot; PC monitor then don't go below a 5570 (<a href="http://www.anandtech.com/show/3601/the-final-word-on-the-best-radeon-htpc-card" target="_blank">link</a>).Hope that helps...The difference is the deinterlacing. 1080p doesn't require it whereas HD TV is 1080i and does require it. The extra processing is enough to tip your GPU/CPU over the edge. It may be possible to configure your current system in such a way that the GPU does hardware accelerated video decode and the CPU does deinterlacing... sharing the load. The other thing you could do which is probably not at all desirable is to reduce the output resolution to your monitor/TV. That would possibly reduce the workload on your GPU enough to allow it to play the HD channels smoothly.mm</blockquote>

[QUOTE="mm1352000, post: 779806, member: 82144"] I find it difficult to answer questions like this. Invariably we want to use the cheapest and quietest GPUs, however those same GPUs are the ones that don't always have enough grunt - it is a bit of a minefield. I can't comment for NVidia as I've only owned an old 6600GT. On the ATI side I'd say don't go below a 4670 in the 4*** series. In the 5*** series don't go below the 5450, and if you want to use it with a 30" PC monitor then don't go below a 5570 ([URL="http://www.anandtech.com/show/3601/the-final-word-on-the-best-radeon-htpc-card"]link[/URL]). Hope that helps... The difference is the deinterlacing. 1080p doesn't require it whereas HD TV is 1080i and does require it. The extra processing is enough to tip your GPU/CPU over the edge. It may be possible to configure your current system in such a way that the GPU does hardware accelerated video decode and the CPU does deinterlacing... sharing the load. The other thing you could do which is probably not at all desirable is to reduce the output resolution to your monitor/TV. That would possibly reduce the workload on your GPU enough to allow it to play the HD channels smoothly. mm [/QUOTE]

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