Also tried an external hard disk that connects to my laptop (Intel Haswell based as well) at usb 3.0 and even that connected at usb 2.0 speeds. In particular I'm trying to get a sanddisk cruzer fit 3.0 to connect at 3.0 speeds to no avail. At the first, I though it was a front port issue (have seen that happen before), but the same thing happens with the back ports too. Recently built a 5820k based system with a Gigabyte X99 UD3P board, installed all latest drivers again, enabled xHCI mode everywhere in the bios (and disable EHCI to be sure) but my USB 3.0 devices still connect at USB 2.0 speeds.
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