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Some USB 3.0 ports are slower than others.

post #1 of 4
Thread Starter 
On my Z68 motherboard, there are 4 USB 3.0 ports in the back. For some reason, when connected to my external HDD, two of them will show roughly 170MB/sec read speed in CrystalDiskMark, while the other two are limited to about 110MB/sec.

Why does this happen? Is this normal?
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post #2 of 4
It's probably the fact that some are native USB 3 ports from the chipset that run better and others are from an add on controller.
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post #3 of 4
if they all use the same controller weird...

yep according to asrock's website all of the rears are controlled by an asmedia controller.

perhaps latency from the port to the controller to the pch?

there are actually 3 asmedia chips on that board and they go through the plx chip aswell so ya im thinking latency or a slow controller which is highly doubtful...

have you tried the 2 front ports with your drive?
Edited by Master__Shake - 7/20/13 at 8:32pm
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post #4 of 4
Thread Starter 
Quote:
Originally Posted by Master__Shake View Post

if they all use the same controller weird...

yep according to asrock's website all of the rears are controlled by an asmedia controller.

perhaps latency from the port to the controller to the pch?

there are actually 3 asmedia chips on that board and they go through the plx chip aswell so ya im thinking latency or a slow controller which is highly doubtful...

have you tried the 2 front ports with your drive?
Quote:
Originally Posted by Wolfram View Post

It's probably the fact that some are native USB 3 ports from the chipset that run better and others are from an add on controller.

The two front ports seem to be limited to 110 mb/sec as well. Could it be that some ports have shared bandwidth with each other and some ports are independent?
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Project Chloe
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