| 1 | A | B | C | D | E | F | G | H | I |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 2 | PCI Express - History and revisions |  |  |  |  |  |  |  |  |
| 3 | PCI Express version | Introduced | Line code | Transfer rate | Throughput | Throughput | Throughput | Throughput | Throughput |
| 4 | PCI Express version | Introduced | Line code | Transfer rate | ×1 | ×2 | ×4 | ×8 | ×16 |
| 5 | 1.0 | 2003 | 8b/10b | 2.5 GT/s | 250 MB/s | 0.50 GB/s | 1.0 GB/s | 2.0 GB/s | 4.0 GB/s |
| 6 | 2.0 | 2007 | 8b/10b | 5.0 GT/s | 500 MB/s | 1.0 GB/s | 2.0 GB/s | 4.0 GB/s | 8.0 GB/s |
| 7 | 3.0 | 2010 | 128b/130b | 8.0 GT/s | 984.6 MB/s | 1.97 GB/s | 3.94 GB/s | 7.88 GB/s | 15.8 GB/s |
| 8 | 4.0 | 2017 | 128b/130b | 16.0 GT/s | 1969 MB/s | 3.94 GB/s | 7.88 GB/s | 15.75 GB/s | 31.5 GB/s |
| 9 | 5.0 | expected in Q1 2019 | 128b/130b | 32.0 GT/s | 3938 MB/s | 7.88 GB/s | 15.75 GB/s | 31.51 GB/s | 63.0 GB/s |

Question: How does PCI Express 3.0 line code different from the 2.0 version? 
Answer: PCI Express 3.0 upgrades the encoding scheme to 128b/130b from the previous 8b/10b encoding.