FlashArray//X R4 (and the associated //C R4) models, introduced with the PCIe Gen 4 architecture, feature support for 64Gb Fibre Channel (FC) connectivity. The default Fibre Channel Host Bus Adapters (HBAs) and the accompanying SFPs shipped with this generation are 64Gb capable, marking a significant performance leap from the 32Gb standard of the R3 generation.
While the HBAs are backward compatible with 32Gb and 16Gb SAN infrastructures, the R4 platform is explicitly marketed and technically defined by its ability to drive 64Gb line speeds to match the increased throughput of the backend PCIe Gen 4 bus and DirectFlash Modules. For an Implementation Engineer verifying the bill of materials or configuring the switch ports, it is critical to know that the R4 optics are native 64Gb. If the customer's switch infrastructure is only 16Gb or 32Gb, the ports will auto-negotiate down, but the shipped default hardware is the 64Gb standard (Option C). Option A (16Gb) and Option B (32Gb) refer to the default standards for the older //M and //X R2/R3 generations respectively.
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