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I don't know. I expect that all 3 modes are able to do video-speed, but that the low-power modes might be able to do some trick in the refresh rates dynamically as required by the content that is displayed on the screen. So if you are just reading text, it would somehow speed down to lowest power consumption mode and as soon as you move your mouse or launch some animation or something needs to move, then the refresh rate might kick in and the CPU is woken up as well.
That is one of the huge amazing features of the One Laptop Per Child project, the so called DCON chip can handle the refreshes of the screen as some type of static image and the main processor can be switched completely off, and only turned on again when it's needed. So for reading ebooks, the main processor only turns on for a few milliseconds to turn the page, and then is turned totally off, in effect saving something like 99% of the power usage from the main processor.
That is why the goal with Pixel Qi is to have 20 hour of battery life using a standard and cheap 3-cell battery.
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