IBM 74Y4064 Handbook page 76

The PCIe3 2-port 100 GbE NIC & RoCE QSFP28 Adapter is a PCI Express (PCIe) generation 3 (Gen3), x16
adapter. The adapter provides two 100 Gb QSFP28 ports. The PCIe3 2-port 100 GbE (NIC and RoCE)
QSFP28 Adapter supports both NIC (Network Interface Controller) and IBTA RoCE standards. RoCE is
Remote Direct Memory Access (RDMA) over Converged Ethernet. Using RoCE, the adapter can support
significantly greater bandwidth with low latency. It also minimizes CPU overhead by more efficiently
using memory access. This offloads the CPU from I/O networking tasks, improving performance and
scalability.
Note: Each port maximum of 100 Gb assumes that no other system and or switch bottlenecks are present.
The adapter allows full bandwidth for a single port in a PCIe3 slot and up to 128 Gb/s minus overheads
for both ports.
Figure 24. PCIe3 2-port 100 GbE NIC & RoCE QSFP28 Adapter
Specifications
Item Description
Adapter FRU number
00WT078 (Designed to comply with RoHS requirement.)
I/O bus architecture
PCIe3 x16
Slot requirement
For more information about slot priorities, maximums, and placement rules, see PCIe adapter
placement rules and slot priorities (http://www.ibm.com/support/knowledgecenter/POWER9/
p9eab/p9eab_mtm_pciplacement.htm) and select the system that you are working on.
Voltage
3.3 V
Form factor
Short, low-profile (FC EC3L)
Short, with full-height tailstock (FC EC3M)
Cables
60
Managing PCIe adapters