Brother, I've got a Syba USB 3.0 card that uses the uPD720200 NEC chipset.
I've reseated, re-slotted my Syba card multiple times as well as uninstalling and reinstalling every driver that Station Drivers has for the uPD720200 NEC chipset. Device manager says all is working normally. Using Driver 22.214.171.124.0 and 126.96.36.199 firmware.
I've NEVER been able to get anything saying it's connected at USB 3.0 speed and Windows displays a popup stating that the device can run faster if plugged in to a USB 3.0 port. I get a 650 mbps write speed to my USB 3.0 exterior enclosure, but NirSoft USBDeview says it's USB 2.1. My USB 3.0 flash drive also says USB 2.1.
As I Google for this problem, it seems very common, and everyone says the NEC drivers for the first gen add-on boards are crap and don't work on Windows 7 x64.
I can testify to that, as I also been unable to get them to work. I said to hell with it, I'm not wasting anymore time on this.