Quote Originally Posted by papatsonis View Post
p.s.>the upper 2 usb3 ports seems likely to be directly connected to pch (thats why asrock advertises them for better performance...), all the other must be via PLX chip which alone i think adds some latency to attached devices.. could that be the solution to our problems..? some latency/buffer added to driver, to overcome that stall
I agree. They should add some latency into the driver.
Also in case of the JMicron, the USB 3.0 transactions could be too fast. I think the communication with JMicron should be slowed down, to be more reliable.

Actually I get slower speeds with the NEC combined with good stability.
The Etron is faster with JM539, but less reliable.