USB data transfer speeds: case vs motherboard

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sonorityscape

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I've been experimenting with the different usb ports on my case. It seems the ones at the top, on the front of my case have been fluctuated annoyingly from 80 to 100 MBps and then will drop down to around 0 for ten to twenty seconds and will do this consistently until the file is transferred. However, if I connect directly to the MB on the back of the case, the transfer speed is consistently around 100MBps. Would anyone have an explanation for this?
 
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The quality of routing on the motherboard. the quality of the cables from the motherboard to the front panel and the quality of the front panel PCB/ports all affect how stable front panel ports are going to be.

I can use a 9' extension (3+6) on ports at the back of my motherboard with no problems but with the front ports, I can only use a 6' extension and it has to be a single piece one.

Also, if your motherboard has additional USB3 ports powered by add-on chips, ports powered by add-ons are likely to perform differently from chipset ports.
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sonorityscape

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Wouldn't this then be normal between everyone since I assume that's how most builds are set up?

 
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TMTOWTSAC

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Jun 27, 2015
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It may have something to do with how the ports are divided between controllers, and whether or not anything else is attached to them. Some manufacturers split the ports up in non-intuitive ways, such as having a front and back port on the same controller. That can have a pretty significant impact if you're transferring from one USB device to another.
 
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InvalidError

Titan
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May 18, 2007
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The quality of routing on the motherboard. the quality of the cables from the motherboard to the front panel and the quality of the front panel PCB/ports all affect how stable front panel ports are going to be.

I can use a 9' extension (3+6) on ports at the back of my motherboard with no problems but with the front ports, I can only use a 6' extension and it has to be a single piece one.

Also, if your motherboard has additional USB3 ports powered by add-on chips, ports powered by add-ons are likely to perform differently from chipset ports.
 
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