well I bought that card and i have to say its HORRIBLE i get no where near my regular download speed i don't know why you suggested it. I'm getting 100kb/s instead of my 1.3mb/s. (fyi the speed my internet provider says its 12mbps i posted my actual download speed) thanks for having me waste my money you don't deserve that best answer.
I have the same card, and i do get 1.3MB/s. (consistently, and thats also the limit of my connection)DO NOT
use the driver from the box/windows, it is outdated and has some sort of bug.(The bug only shows itself in downloads and gaming, and not regular browsing)
Goto the asus site and install the most recent driver, and then you will get the speed you want.
Also the 12Mbps, is in bits you need to divide by 8 to get it to MBps. Which should be around the 1.3MBps you were seeing before.