I was just needing to know whats the peak frequency down a usb wire?

Just guessing... 3ghz?

 

Depends on bitrate.
1.5 Mbits/s is the lowest.
10000 Mbits/s is the highest.

 

Check out the USB Wiki

https://en.wikipedia.org/wiki/USB

 

USB3 is rated now for up to 5gbs (640MBps) but has been found in practice to be quite a bit lower, but still quite a bit higher than USB2.
Max.

 

I see - its not the "frequency" its the bitrate, thankyou.