Nascar Nut wrote in post #19162643
It would be nice to just pop a cf card into the front panel of my tower instead of a card reader. Much of the front panels that I have looked at have mixed reviews. The manual shows that I have a USB 3.0 cable connector and USB 3.1 (Type-C) cable connector on my motherboard. I just ran a test with a 128gig lexar 1667 250MB/s in the SD slot on my front panel. Transferring files to an SSD drive I got around 190mbs and to an external drive I got around 120mbs. With a USB 3.1 (Type-C) card reader or front panel that would connect to the USB 3.1 (Type-C) cable connector on my motherboard get any faster speeds?
Maybe, maybe not. "John from PA" and I agree your existing reader runs into a bus that is at least 5Gb/ sec, we possibly might disagree the type of bus, but that is a quibble at this point since the bus is faster than what you are feeding into it. There's some overhead needed to transfer the data, such as flow control, packet framing, and other data to to do the transfer, making the bus around 400 MB/sec of your data (note the change in units, from bits to bytes, to match your measurements). You are getting better than half that speed with the Lexar. I don't know if the card reader is limiting the speed or just traffic on that bus from other devices.
Plugging into that port means the loss of the external USB plug, and having to somehow connect your device to that connector on the motherboard, which isn't a type-C connector.