I have installed a new USB 3.0 card and while it's working, the write speed doesn't seem to improve much. Write speed is between 3-5 for usb 2 and about 5 consistent for usb 3.
Write speed for 2.0 is around 40 while 3.0 is around 80.
This is the thumb drive
https://www.amazon.co.uk/gp/product/B00G9WHN12/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
This is the card
http://www.ebay.co.uk/itm/272228254051?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Write speed for 2.0 is around 40 while 3.0 is around 80.
This is the thumb drive
https://www.amazon.co.uk/gp/product/B00G9WHN12/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
This is the card
http://www.ebay.co.uk/itm/272228254051?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT