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<blockquote data-quote="magao" data-source="post: 472723" data-attributes="member: 86026">The most likely cause of CUDA not working in MP is insufficient video memory. MP does use quite a bit of the video memory for itself, thus reducing the amount available for decoding. With only 256MB on the card, you might well be hitting the limit.Try some 576p, 720p and 1080p videos and see if CUDA activates for any of them. Also see if you can borrow a 512MB card from someone to try out.BTW, CoreAVC 1.9.0 had some pretty severe blocking problems with CUDA (which is what the linked thread talks about) - CoreAVC 1.9.5 has fixed those. To my naked eye (haven't done 1:1 comparisons) there is no difference in quality between MPC-HC, CoreAVC, ffdshow-tryouts or PowerDVD whether using software or hardware.There are 2 big advantages to CUDA:1. The CPU doesn't have to work as hard, this hopefully saving power (and allowing a lower-spec machine to handle higher-quality video);2. The decoding is offloaded to the GPU, but the decoded video is available for post-processing on the CPU, allowing a lower-spec machine to do things like apply resizing, debanding, etc.The 8600GTS was a fairly power-hungry card - if all you're using it for is an HTPC, I'd recommend replacing it with a 512MB 8400GS or 9400GT (and hopefully upgrade a family member's game playing capability on the cheap).</blockquote>

[QUOTE="magao, post: 472723, member: 86026"] The most likely cause of CUDA not working in MP is insufficient video memory. MP does use quite a bit of the video memory for itself, thus reducing the amount available for decoding. With only 256MB on the card, you might well be hitting the limit. Try some 576p, 720p and 1080p videos and see if CUDA activates for any of them. Also see if you can borrow a 512MB card from someone to try out. BTW, CoreAVC 1.9.0 had some pretty severe blocking problems with CUDA (which is what the linked thread talks about) - CoreAVC 1.9.5 has fixed those. To my naked eye (haven't done 1:1 comparisons) there is no difference in quality between MPC-HC, CoreAVC, ffdshow-tryouts or PowerDVD whether using software or hardware. There are 2 big advantages to CUDA: 1. The CPU doesn't have to work as hard, this hopefully saving power (and allowing a lower-spec machine to handle higher-quality video); 2. The decoding is offloaded to the GPU, but the decoded video is available for post-processing on the CPU, allowing a lower-spec machine to do things like apply resizing, debanding, etc. The 8600GTS was a fairly power-hungry card - if all you're using it for is an HTPC, I'd recommend replacing it with a 512MB 8400GS or 9400GT (and hopefully upgrade a family member's game playing capability on the cheap). [/QUOTE]

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