Does my iMac G5 have USB 2.0 ports?

This should probably be obvious, but I'm having a hard time figuring it out. Every bit of info I've found online says the three USB ports on the back of an iMac G5 are USB 2.0. But in System Profiler my USB speed is listed as "Up to 12 Mb/sec," and I've found information that says that that means I only have USB 1.1. So I'm confused. Do I have USB 1.1 or 2.0?

The reason I need to know is that I'm looking to buy an external hard drive, and the one I have my eye on says it uses USB 2.0, and I need to make sure it'll work before I buy it.

Thanks for the help.