HTC 10 USB 3.1 Fast File Transfer Speeds Much Lower than 5Gbps

I've bought three USB 3.1 cables from Amazon, one cable from Startech, one cable from TechMatte, and one cable from FRiEQ. All of these cables are Benson Leung approved.

• Initially I bought the Startech cable because I thought the HTC 10 would support USB 3.1 gen-2 (10Gbps), but after further reading I see that the HTC 10 (probably) only supports USB 3.1 gen-1 (5Gps).
• I bought the other two USB 3.1 gen-1 cables so I could have backup cables for my home/work/travel bag etc.
• Then I wanted to confirm that the phone would actually support transfers at the speeds rated by the cables. It would appear it doesn't.

I tested the HTC 10's transfer speeds by connecting it to the USB 3.1 port on my motherboard (ASUS x99-m WS) and testing file transfer speeds, but even connected to a USB 3.1 port speeds are still definitely not fully USB 3.1 gen-1 5Gps. Here are the results that I found.

• With Fast File Transfer mode enabled, transfers for all three USB 3.1 cables complete at ~130-150MB/s read and ~100MB/s write speeds. These speeds are definitely not USB3.1 gen-1 (5Gbps) speeds.
• I tested this by transferring a 700MB file from PC to phone internal storage (not microSD card), then transferring the same file back to PC.
• The test file was transferred to and from the Samsung 950 Pro m.2 SSD drive, so the SSD drive is not the performance bottleneck.
• Transfers were consistently ~3x slower with "Fast File Transfer" mode disabled.
• It's possible that what HTC meant by the "USB 3.1 Gen 1, Type-C" spec was just that it had a USB Type-C cable connector form, regardless of the speed the port could achieve.

Q: Does anyone have USB 3.1 transfers confirmed working at 5Gbps (ie. ~600MB/s)? And if so, what cable/mobo are you using?

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