I've just noted this in first post:

Zitat von Fernando im Beitrag #1

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After the installation the Switch device may be renamed to "PCI bus".

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As I said, I can see one "PCI bus" named device with the same Hadware IDs as Switch - I can see it before my installation of USB drivers.
Could that mean that my "PCI Express Root Complex" could be somehow already "installed" on fresh install of Windows?

Zitat von Fernando im Beitrag #1442

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After having updated the Intel USB Switch Device named "PCI Express Root Complex" you will get a second device named "PCI Bus". To find out, which one is the Intel "USB Switch Device", you should check the HardwareIDs of both listed devices named "PCI Bus" (VEN_8086 means Intel).

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The thing is - I already have two "PCI Bus" devices. Here is my screenshot with Hardware IDs:



I've asked @100PIER, who also has X99 platform about his PCI Bus devices - he has one "PCI Bus" device and one "PCI Express Root Complex" device. Here is his screenshot wiht Hardware IDs:



His "PCI Express Root Complex" looks exactly like one of my "PCI Bus" devices. He has Windows 10, I have Windows 7.

Zitat von Fernando im Beitrag #1437

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@Lex:
The addendum "only if applicable" means: Only if there is a device named "PCI Express Root Complex" listed within the "System devices" section of the Device Manager, you have to install the Intel USB Switch Driver.

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This "PCI Bus" device @ ACPI\PNP0A08 couldn't get off my head so easily so I spent last two days browsing the internet, trying differents things and in the end I can say I think you need to do a small update.

During my searches I was lucky enough to find this link: https://superuser.com/questions/719079/u...el-usb-3-0-xhci

As it says "the Intel(R) USB 3.0 Host Controller Switch Driver is not installed" could cause "USB 3.0 ports function as USB 2.0 ports" so my first idea was to test the speed of my ports. The problem was I had not any USB 3.0 device, so today I bought SanDisk Ultra Flair 3.0 pendrive. I connected it to five different USB ports and tested write/read speed. I used Far Manager to copy a set of few 4GB size files (from HDD to pendrive and from pendrive to HDD) and I observed the results in Windows Resource Monitor.

Here are the results:

USB 2.0 Intel (front): W/R: 10 MB/s / 36 MB/s
USB 3.0 Intel (front): W/R: 10 MB/s / 36 MB/s
USB 3.0 Intel (back): W/R: 10 MB/s / 36 MB/s
USB 3.0 ASMedia (back): W/R: 10 MB/s / 36 MB/s
USB 3.1 ASMedia (back): W/R: 6.5 MB/s / 36 MB/s

As you can see all of them have 2.0 speeds, even ASMedia ones. I do not know why USB 3.1 had only 6.5 MB/s write.

So (still following the link) I decided to take a risk and install this third driver from Intel USB set (Switch Driver) to see if there will be any improvements.

I pointed "PCI Bus" device to iusb3hcs.inf - Windows detected "some suitable driver", installed it and prompted to reboot PC.

After restart, under Device Manager > Universal Serial Bus Controller two new devices appeared: "USB 2.0 MTT Hub" and "USB 3.0 Hub". By comparing the screenshot from before Switch Driver installation, I think one "Generic USB Hub" device disappeared.

Now tests:

USB 2.0 Intel (front): W/R: 10 MB/s / 42 MB/s
USB 3.0 Intel (front): W/R: 10* MB/s / 145 MB/s
USB 3.0 Intel (back): W/R: 10 MB/s / 125 MB/s
USB 3.0 ASMedia (back): W/R: 10 MB/s / 125 MB/s
USB 3.1 ASMedia (back): W/R: 10 MB/s / 145 MB/s

*) On the first try file was written at 6.5 MB/s, just like for USB 3.1 speed from my first USB speed test - maybe it is some Windows internal file cache problem?

I know that my way of testing is not the perfect one (I have not found any other one which could work with pendrive) but installation of Switch Driver on "PCI Bus" helped a lot with read speeds, so it seems to me that presence (or absence) of "PCI Express Root Complex" named device should not determine the installation (or not) of Switch Driver.

Two additional notes:

- There is a screenshot in my link showing "Device lower filters" - there was no such category before Switch Driver installation - it appeared just after.

- Before Switch Driver installation I had some "weird problem" with my older 2.0 pendrives - some of them have LED light to show if the pendrive is active or not. After "safely eject pendrive" the light still stayed "ON" till I physically unplug the pendrive. Then i found this link: https://support.microsoft.com/en-us/help...oved-usb-device and edited registry by adding DisableOnSoftRemove - it solved my "light" problems - as soon as I "safely eject pendrive" the light was going off. Now, the "funny thing" is: before Switch Driver installation I removed DisableOnSoftRemove from registry to test this out - it turned out that Switch Driver installation removed the need for DisableOnSoftRemove - now light is going off without this registry edit.