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USB speed varies between front and back

B

buildingacomputer

Senior member
Same USB thumb drive connected to the back panel gives faster transfer than the front. Mobo has USB jumper. Does it have anything to do with the speed?

Biostar TA785GE (amd 785G) board

Thanks.
 
Usually such a jumper just changes the source of the 5v line used for the USB, with the possibilities being the normal 5v and the 5VSB.

It is also possible that the front ports are either not fully compatible with USB 2.0 or have some other issue (does shielding matter?). I know that at one time Antec was giving people replacement USB ports because of such an issue for owners of certain Antec cases.
 
Zap said:
Usually such a jumper just changes the source of the 5v line used for the USB, with the possibilities being the normal 5v and the 5VSB.
Click to expand...
Please explain this for me. What is the difference between normal 5V and 5VSB?

Zap said:
It is also possible that the front ports are either not fully compatible with USB 2.0 or have some other issue (does shielding matter?). I know that at one time Antec was giving people replacement USB ports because of such an issue for owners of certain Antec cases.
Click to expand...
Thanks for the explanation. By the way I have an old antec case.
 
Zap is right, those jumpers on your mobo are for allowing the USB ports to be powered by the 5V SB. This is StandBy power. That means that if you choose to use this option you can have the USB ports remain powered even if the PC is off.


As for your front panel ports this problem is not that uncommon, especially with older cases. In every case I've seen it always came down to the quality of the front panel cables. If the cables are of poor quality and their impedance is higher than it should you get this kind of problems. I bet that that was the problem that made Antec get in the trouble of replacing cables, which BTW speaks highly of them.


I would suggest that you send them a mail and explore on the possibilities of getting replacement cables even if it's not for free. It would be a shame to stick with a pair of underperforming ports if you can avoid it.
 
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