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The Preview window seemed to freeze although the audio continued, and clicking on different cameras didn't seem to switch the preview to them.
I'd probably do a little more research before thinking that a new GPU will fix the video freeze in MC designer. I believe that issue with the skip is really more of a CPU load rather than GPU. But heck, as I was told before, it's my OPINION, so I won't bore the forum with data to substantiate it.
I can play four 1920x1080 24Mbps streams without a single video skip in MC Editor. Five video cards 3 PC's and every cross combination to "learn".
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In rough numbers, HD files run around 28Mbps and a typical 7200rpm drive can transfer data at ~110Mbps. Since you're looking at editing 4 clips simultaneously in the ME, you'd ideally need 4x28 or 112Mbps- so you should be right at the limit.
Might check that, 28Mbps=3.5MB/sec, 1 byte consists of 8 bits. Video in Mb/s not MB/s. Standard 7200rpm HD these days, 110MB/sec read, so really not a throttle for HD.
Jeff