3 USB not showing up in device tree

Hi folks,

I have a May 2010 17 inch Macbook Pro with 3 USB ports on the left side. I was just checking to see that they were USB 2.0. When clicking on the Apple Logo > About This Mac > More Info > USB, shouldn't I see 3 USB High-Speed Bus in the device tree? I only see 2. When I click on the one that is highlighted in the picture it says up to 480 Mb / sec for the speed. When I click on the "USB High-Speed Bus" 5 columns below it, it also says 480 Mb / sec for speed. I know that these 2 are USB 2.0 because of that. Where is my 3rd USB port represented? Shouldn't there be a 3rd "USB High-Speed Bus" somewhere in there or is it in one of the sub folders?

I was reading online that some of the USB ports on the MBP aren't as fast as the others. Some people said the one closest to the screen is slowest and others said the opposite. Thats what started me to look at the device tree. I use the ports for live audio so it is very important that I use the most effective one.

Thanks so much for your time!