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If a computer case has a USB port in the front, will it support USB 3.0 if my motherboard supports it? Or does the case vendor need to specifically mention USB 3 support? (BTW, I haven't seen such case yet.)

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as gorilla says The difference is in the connectors and cables. That being said, in taking apart multiple cases, I have often found pieces that fit each other between cases. IF you have on of these such pieces, then you need only to swap the 2.0 connector for the 3.0 connector. –  PsychoData Sep 24 '13 at 17:46
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up vote 12 down vote accepted

USB3 requires new connectors, with more connections in them. These are backwards compatible, Therefore a USB1/USB2 device will plug into a USB3 host, but this means that unless your case has the new connectors, you can't in a USB3 device. You could still use these connectors for USB1/USB2 devices, or use USB3 devices in a USB1/2 compatibility mode.

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I was discussing this issue today because I purchased an external USB3 hard disk. My motherbord supports USB3 and my case has two USB3 connectors in front. The other two in the back are those of the motherboard. When I connect my USB3 external disk to front ones, I get a message saying:

The Device can perform faster if connected to USB3 port

Finally we realized that the motherboard haw no extra USB3 plugs for connection to the front of the case. So,They connected the two USB3 in front with the spare USB2 connectors existing in the motherboard.

Hope you understand that although the motherboad supports USB3 and the front of the case has two USB3 ports, those two of the motherboard are available in the back panel of the case only.

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Let's hope that's not true of all motherboards! Surely there must be a motherboard that supports those USB3 ports on your case... if not now, then sometime in the future. –  skypecakes Feb 3 '11 at 18:04
    
There are definitely motherboards around now that have the ability to connect USB3 to the front ports. If you wanted to upgrade the front USB ports to actually support USB3 without upgrading motherboards, you could always install a PCI-E card with internal USB3 ports on it. –  camster342 May 23 '11 at 21:38
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