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USB Voltage?

post #1 of 10
Thread Starter 
Is the amount of power that can flow through your USB ports limited by anything other than just what your power supply can dish out?

I use a USB powered DAC as well as a USB mic and my computer refuses to let both work at once, using a powered USB hub fixed this, my power supply is quite old... http://www.newegg.com/Product/Product.aspx?Item=N82E16817190012 and it is powering an i5 750 at 4GHZ and a GTX 670.

Would replacing the old sucker fix my issue or is there a limited amount of power USB's can draw?
Swamp Creature
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post #2 of 10
USB 2.0 is only rated for about 500-900mA @ 5v

So; P=IV;
Power= 2.5-4.5 watts

No, changing power supplies won't do anything, USB power is handled through the motherboard and I guarantee your PSU is not reaching its max load. wink.gif
post #3 of 10
Thread Starter 
Thing is I can take the USB devices in question to my buddies house and they both power and work simultaneously without the use of a powered USB hub? But both devices refuse to work in the same fashion on my pc? I did not initially think I was maxing out my power as well but for some reason one has to be run through a powered USB hub? so If I wish to solve the issue so I don't need a powered USB hub what should I do?

Motherboard btw http://www.asrock.com/mb/Intel/P55%20Extreme/

I should also mention both devices work alone just fine I only run into the issue when trying run them both off the motherboards USB's at the same time
Edited by Wrath42 - 11/27/12 at 10:31pm
Swamp Creature
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post #4 of 10
Do you have them both plugged directly into the motherboard ports in the back of the PC, or in the front ports?
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post #5 of 10
Thread Starter 
Back of the motherboard I only use the fronts for my phone and flash drives haha
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post #6 of 10
Have you tried multiple combinations of ports? Like the 2 devices plugged in ports right next to eachother, above and below, as far apart as possible etc.?

If that doesn't work, I have no clue...
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post #7 of 10
Differences in 2.0. Didn't the original 2.0 only provide 2.5 watts, while later revisions (and all 3.0) provide 4.5 watts? If so...

EDIT: looking at that board they are all 2.5watt aren't they?
Edited by Senator - 11/27/12 at 11:58pm
    
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post #8 of 10
Thread Starter 
Yes I have tried different ports for about an hour, nothing worked, the only thing I am powering besides these 2 devices giving me issues is a mouse and a keyboard, once again the devices power just fine when only 1 of them + mouse and keyboard are plugged in, but with both of them plugged in to the back of the motherboard if one of them is in use the other wont work, I have disabled all other audio devices and disabled my onboard sound card.

The only way I can get them to play is to run one of the devices through a powered USB hub period frown.gif

Curious is 2.5 watts the draw each USB is allowed? Or is that the maximum combined USB use? I don't have any knowledge when it comes to this because I have never run into an issue with the USB's

Here are the 2 devices giving me problems

http://bluemic.com/yeti/#/specs/

http://www.jdslabs.com/item.php?fetchitem=46 (Said to draw a bit under 1 watt from the USB)

I am guessing from the looks of it they should not be drawing too much power to be used directly off the motherboard?
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post #9 of 10
It's gotta be a software issue, try re-installing the USB drivers for your motherboard, see if there is a change. Did it always behave this way?
post #10 of 10
Thread Starter 
Not with these particular devices, It has with previous USB Audio audio devices though, I initially thought it was a software issue but the powered USB port fixed my issue and so I was curious and started this thread, so what should i just uninstall all my Microsoft USB drivers in device manager?
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