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 |
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x1 | 250 MB/s | 500 MB/s | 1 GB/s |
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x4 | 1 GB/s | 2 GB/s | 4 GB/s |
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x8 | 2 GB/s | 4 GB/s | 8 GB/s |
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x16 | 4 GB/s | 8 GB/s | 16 GB/s |
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