The Alveo U55C accelerator card uses an AMD UltraScale+™ FPGA containing a PCIE4C block. The PCIE4C block is compliant to the PCI Express Base Specification v3.1 supporting up to 8.0 GT/s (Gen3 x16) and compatible with PCI Express Base Specification v4.0 supporting up to 16.0 GT/s (Gen4 x8). The PCIE4C block is also compliant with CCIX Base Specification Revision 1.0 v0.9, supporting speeds up to 16.0 GT/s. The PCI Express interface can also be configured into dual x8 interfaces and connected to hosts that support PCI Express bifurcation.
| PCI Express Generation | Performance |
|---|---|
| Gen 1 | 2.5 GigaTransfers per second (GT/s) |
| Gen 2 | 5.0 GT/s |
| Gen 3 | 8.0 GT/s |
| Gen 4 1 | 16.0 GT/s |
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