GT/s is GigaTransfers per second, so it's only how many times a signal is sent per second.
Amd does have a similar implementation as the i7, so it's about the same per GT for each.
No, GT/s is just the bandwidth between the entire processor and the peripherals, GT/s is actually just Ghz X 2 so a 2.4Ghz transfer rate is 4.8GT/s.