Dell PowerEdge B02S Hardware Owner's Manual page 7

InfiniBand (IB) Support Limitation
Host servers will not support more than one IB card installed in a C410x.
If more than one IB card is installed in a C410x and connected to a single host server issues may be
observed.
Checklist
Carefully unpack the Dell PowerEdge C410X server and check that the following items were included.
One Dell PowerEdge C410X system
Dell PowerEdge C410x Getting Started Guide
Safety, Environmental, and Regulatory Information (SERI)
Warranty and Support Information (WSI) or End User License Agreement (EULA)