One thing to check are the USB Hub entries. Two more USB 3.0 ports are provided by the ASMedia ASM1042 chip.īut the more I think about it, the more I see what might be going on. The specified number of Intel USB 3.0 ports is six on your board, and eight USB 2.0 ports. Your theory contends that all 14 Intel USB ports (2.0 + 3.0) can be controlled by the USB 3.0 controller in the Z77 chipset at the same time. Each USB controller can only provide resources/connections for X number of USB ports. Still, you could try to prove your case, but I have doubts about that. The actual drivers being used are shown, for the Enhanced and eXtensible controllers, and are what I would expect. Note that each of the Driver File Detail displays show the same 3.0 File Version, while two out of three displays show different driver files. These are Device Manager Properties of some of the USB controllers on that board: This is from my X99 board with Windows 10 installed. I know you have taken that information from Windows itself, from an error log, but let me show you what I mean. Regarding your question about the Z77 Extreme4 board, I don't know if what you wrote is true or not, I have that board and it will take some experimentation to verify that, if possible.īut first, I must say I don't think you have made your case with the '3.0' driver version for both USB controllers. If what you seem to be saying is true, then your DAC will not work on any Intel Skylake system. If you install Windows 7 on an Intel Skylake/100 series chipset system, none of the USB ports will work during the installation, unless a USB 3.0 driver is added to the Windows 7 installation media. That's because the new Intel Skylake/100 series chipset systems will only use the USB 3.0/eXtensible Host Controller Driver for both the USB 2.0 and USB 3.0 controllers. If the Schiit MODI DAC can only work with the generic Windows USB 2.0 driver, which is what you seem to be saying, then they should have taken care of that last year.

Usb 2 vs usb 3 schiit