Solution
There are no physical slot differences between different generations of PXIe cards. You can expect backward compatibility through various PXI/PXIe generations and can replace older modules with the newer version of that same module. However, the different generations will have differences in maximum data transfer rate:
| | Gen 1 | Gen 2 | Gen 3 |
|---|
| x1 | 250 MB/s | 500 MB/s | 1 GB/s |
|---|
| x4 | 1 GB/s | 2 GB/s | 4 GB/s |
|---|
| x8 | 2 GB/s | 4 GB/s | 8 GB/s |
|---|
| x16 | 4 GB/s | 8 GB/s | 16 GB/s |
|---|