Why does my motherboards come with both chipset and USB 3.0 drivers?

spellbinder2050

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Sep 7, 2008
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I'm looking at my motherboard drivers after reading a bit about chipsets. Why does my motherboard come with both chipset and USB 3.0 drivers? Wouldn't the chipset drivers have the USB BIOS on them themselves?

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Is the USB controller not on the Southbridge? Is there both a USB 3.0 and 2.0 controller on this motherboard?

I'm running an Asus P6x58DE X58/Core I7 first generation motherboard from 2010. USB 3.0 was new at the time.

https://www.asus.com/Motherboards/P6X58DE/
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131641