I have a ASUS K55VM laptop which has 2 USB 3.0 ports. I'm running on Windows 8 x64. When I use plug in a USB 3.0 external hard drive from any 1 of the USB ports I get write/read speeds of only ~25MBps. This opposed to my other laptop (Dell XPS with USB 3.0 ports also running on Windows 8 x64) gets ~100MBps.
I have also searched for installed the relevant drivers for my ASUS laptop.
Intel points out the following: USB 3.0 Support
Here's the link to the FAQ Intel article: USB 3.0 devices are not working at USB 3.0 speed in Windows 8*
In the second link, I do not understand the cause. I have included a picture of the device manager for reference.
Here's a picture of the external hard drives in question. It's a Toshiba Canvio 1TB.
When I plug it onto the ASUS one, notice that the light glows
When I plug it into the DELL one, notice that the light glows
BLUE indicating that it is functioning in true USB 3.0 mode.