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USB 3.0 puts out more amps than 2.0, buts it's still about .9A. Nothing near the 2.0A for Drag Mini but compared to charging some devices 3.0 would of course be betterYes and no to that...This is something that was a must for me to have in my laptop. I'll just post links to explain the mindfulness of why I needed it, to charge certain devices actually. I have OEM cords I tried using, with failure. The ports are more efficient but run much differently in order to charge and relay data back and forth...
http://usb3pcicard.com/usb-3-0-outputs-more-power-than-usb-2-0/
http://usb3pcicard.com/usb-3-0-uses-less-power-than-usb-2-0/
The transfer data rate between 2.0 and 3.0 is huge, but there's a lot more into transferring data than what the USB is rated at. Most wouldn't see a difference in the 2 because of the amount of data most user's deal with. Ya hafta be moving a lot of data at once to see a diff. Like transferring a lot of video (2hrs is roughly 2BG). The performance of the pc comes into play as well. If transferring huge amounts of data, the processor, the type of drive being used, the amount/speed of the memory, and what and how that's all connected inside the pc matters too. An example would be, as a drive an SSD is fast when it's connected to the motherboard via a sata cable. But an SSD can also be connected to the mb through pci express https://computer.howstuffworks.com/pci-express.htm , which is faster. The rate at which data can be moved within memory is very impressive, "100 MHz, DDR3 SDRAM gives a maximum transfer rate of 6400 MB/s." (https://en.wikipedia.org/wiki/DDR3_SDRAM), and 100MHz is on the slow end. All data moves in and out of memory. Drive>memory>processor or processor>memory>drive. Also having enough memory to store what's being transferred is key. If the processor asks the drive for a video, and the drive can't send it all to memory, then the processor has to wait thus slowing down the transfer. ik, tmi....