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Benefits of using USB 3.0 ports with USB 2.0 devices


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5 replies to this topic

#1 Andrew

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Posted 30 July 2009 - 11:12 AM

What are the benefits, if any, of getting a USB 3.0 card before USB 3.0 devices are available? Will a USB 2.0 device perform better?

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#2 garmanma

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Posted 30 July 2009 - 01:11 PM

Besides the controller card, it looks like the cable itself is important

USB signals are transmitted on a braided pair data cable with 90Ω 15% impedance,[10] labeled D+ and D−. Prior to USB 3.0, These collectively use half-duplex differential signaling to reduce the effects of electromagnetic noise on longer lines. Transmitted signal levels are 0.00.3 volts for low and 2.83.6 volts for high in full speed (FS) and low speed (LS) modes, and −1010 mV for low and 360440 mV for high in hi-speed (HS) mode. In FS mode the cable wires are not terminated, but the HS mode has termination of 45Ω to ground, or 90Ω differential to match the data cable impedance, reducing interference of particular kinds. USB 3.0 introduces two additional pairs of shielded twisted wire and new, mostly interoperable contacts in USB 3.0 cables, for them. They permit the higher data rate, and full duplex operation.


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#3 hamluis

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Posted 30 July 2009 - 01:38 PM

Thanks for the heads-up :thumbsup:.

I found this article, http://www.maximumpc.com/article/features/...ed_cable_photos

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#4 nodnarB7891

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Posted 31 July 2009 - 01:56 AM

It won't do jack squat. You'll still be limited to USB2.0 speeds, even if it is a 3.0 device using a 3.0 cable.

#5 Andrew

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Posted 31 July 2009 - 12:06 PM

It won't do jack squat. You'll still be limited to USB2.0 speeds, even if it is a 3.0 device using a 3.0 cable.

Umm, what? Using a 3.0 device, connecting with a 3.0 cable to a 3.0 port yields 2.0 speeds... I think there's a miscommunication here.

#6 nodnarB7891

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Posted 31 July 2009 - 10:04 PM

I read it as connecting a USB 3.0 device to a 2.0 port, so there was a miscommunication.




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