My 3-year-old office machine (Intel C2.4GHz CPU, 4GB RAM, GeForce 8800GTS graphics, Vista 64) sure does choke: choppy playback, severe compression artifacts. The vast majority of computers will choke on 4K. People attempting to view 4K clips on their supposedly high end systems will be disappointed to not being able to see the 4K quality. None of them are accessible to regular mortals outside of 4K post production houses and Malibu celebrity row. Seriously, most high resolution monitors max out at 1080p and there are very, very few monitors or projection screens out there that can display 4K. Then go to your nearest Imax theater - they should let you fire up your 4K YouTube video after hours, right? Or, rent one of those 4K projectors and a 25' screen for something like $5K a day. watch it on your iPhone? Oh wait, it's less than 4 inches and you need 25 feet of real estate to view it. You go buy a 4K Red One camera ($25-50K with lenses and accessories), shoot an awesome 4K video, upload it to YouTube and. That's 6 times your average Joe's 50-inch TV and most apartment walls are 10 to 14 feet unless you feel like finding an empty wall at Ralph's. The official YouTube blog post says that "the ideal screen size for a 4K video is 25 feet".
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