Do I need to take up one of my USB ports on my MBP when using this dual link mini-dvi cable?

I just upgraded my MBP to the latest model. It no longer has an input DVI port as the old one did. I also have a MAC 30" monitor. I am not sure if I need to take up one of the 2 USB ports for theDual-Link DVI adapter. I have the mini-dvi port plugged in, but am a bit stumped as if or why I would need to take up one USB ports.

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Mini DisplayPort to Dual-Link DVI Adapter

Mini DisplayPort to Dual-Link DVI Adapter

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