It's good that you are going for SD Ultra. In my PC, I get about 24-28 mbps speed while transferring data from HDD and vice versa. Excellent READ/WRITE speed.
is it a standard that the inside of the plug of USB 3 device be Blue in color?
on my mobo the USB socket is Blue where it's USB3.
got Sandisk Ultra 16GB from Snapdeal for about 440rs.
Ran a small freeware utility USBDeview and it gave speedtest results 36 MB/s Read and 100 MB/s for Write. Overall looks good to me..thanks again!