Nvidia ConnectX-6 User Manual page 14

ConnectX-6 Single-slot Socket Direct Cards (2x PCIe x8 in a row)
The PCIe x16 interface comprises two PCIe x8 in a row, such that each of the PCIe x8 lanes can be
connected to a dedicated CPU in a dual-socket server. In such a configuration, Socket Direct brings
lower latency and lower CPU utilization as the direct connection from each CPU to the network
means the interconnect can bypass a QPI (UPI) and the other CPU, optimizing performance and
improving latency. CPU utilization is improved as each CPU handles only its own traffic and not
traffic from the other CPU.
A system with a custom PCI Express x16 slot that includes special signals is required for installing the
card. Please refer to
definitions.
Part Number
Form Factor/Dimensions
Data Transmission Rate
Network Connector Type
PCIe x16 through Edge Connector PCIe Gen 3.0 / 4.0 SERDES @ 8.0GT/s / 16.0GT/s Socket Direct 2x8 in a
RoHS
Adapter IC Part Number
PCI Express Pinouts Description for Single-Slot Socket Direct
MCX653105A-EFAT
PCIe Half Height, Half Length / 167.65mm x 68.90mm
Ethernet: 10/25/40/50/100 Gb/s
InfiniBand: SDR, DDR, QDR, FDR, EDR, HDR100
Single-port QSFP56
row
RoHS Compliant
MT28908A0-XCCF-HVM
Card for pinout
MCX653106A-EFAT
Dual-port QSFP56
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