Effective Bandwidth

Two chiplets communicate over an Advanced Interface Bus (AIB). The data bus is exactly 1024 bits wide per direction. The interface is driven by a 2.0 GHz clock and uses Double Data Rate (DDR) transmission (transferring data on both the rising and falling edges). To ensure signal integrity, the physical layer applies standard 8b/10b encoding. What is the effective unidirectional data bandwidth in Gigabytes per second (GB/s)?