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People need to consider the data being virtualized here is big, really big. A RGB24 1920x1080 24fps progressive stream is 149,299,200 bytes per second. Even a YV12 (4:2:0) 720x480 60i is still 15,552,000 bytes per second. This is 24% more than the theoretical maximum transfer of a 100Mb/s ethernet (probably more than twice the practical throughput). These numbers are even a small chunk out of a 800MHz FSB memory channel at around 6,400,000,000 bytes per second.
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