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The Dell PERC H755N front NVMe adapter is based on the Broadcom® SAS3916 PCIe to SAS/SATA/PCIe RAID on Chip (RoC) controller. These are the first RAID controllers from Dell Technologies to offer both PCIe Gen4 host and PCIe Gen4 storage interfaces, which deliver double the bandwidth and 75 percent more I/O operations per second (IOPS), compared to previous generations.7
The Dell PERC H755N provides high PCIe (NVMe) storage-interface data-transfer rates of 16 gigatransfers per second (GT/s), 8 GT/s, 5 GT/s, and 2.5 GT/s per lane, in addition to reliability, high performance, and fault-tolerant disk subsystem management and support for RAID levels 0, 1, 5, 6, 10, 50, and 60.
The Dell EMC PowerEdge R750 server used in our testing paired the Dell PERC H755N NVMe adapter with all-NVMe SSDs to maximize storage bandwidth and throughput. Previous-generation servers supported NVMe drives only as individual, discrete disks. To achieve RAID functionality, the older Dell EMC PowerEdge R740xd server would have to be configured with slower, bandwidth-constrained SATA SSDs.
7 Source: Broadcom internal data, provided by Dell Technologies.