hi jairo, i found this (you're not alone; this topic is still under debate at intel). if you're interested, you can try this out.

it basically means the poster solved his usb 3.0 issue by using the latest chipset driver from intel. in that package, it contains the usb 3.0 drivers that work for windows 8. i found this to be the latest, instead of the original link from that post (for desktop boards).

edit: here is another alternative. if you're OK with it, then just go ahead.

In my experience transferring large files using USB 3.0 you are getting good transfer speeds. That's about the same transfer speed you would get with a internal SATA 11 5400 hard drive internally!! All these super fast speeds people are talking about are benchmarks also I have found that small files will transfer quite quickly. To insure you are connecting USB 3.0 benchmark your external drives USB 2 and then USB 3 you'll see that the benchmark should be about 2.5 times faster more or less. Actual file transfer will be much slower. This is true for Internal drives as well as external drives. I have found that USB 3 is just a little slower than eSATA for actual file transfers while they will benchmark pretty much the same. All this I speak of is using the same actual hard drive same external case same computer. I find this is consistent over the three computer I have that have USB 3. I could only test the eSATA on one computer as my G75 does not have eSATA nor my Wife's HP Envy touch screen. Regardless Bench mark your external drives that will tell you if you actual have a problem.

anyone found a solution to this yet? I've been frustrated with getting the usb 3.0 external drive to work more than 40mb per sec. I was able to get 240 read and 120 write on the desktop 3.0 ports but on my Asus G46 its 30-40 read and write. Whenever i plug it in it says this device might be faster if you connect thru usb 3.0 ports... I already have all the usb 3.0 drivers installed along with the newest one from intel few days ago. Nothing's working yet

You may wants o just try and reinstall the dirvers over that the simplest solution