Ethernet 10/25Gb 2-port 640FLR-SFP28 adapter, FlexibleLOM form-factor - Has two dual 10/25Gbe SFP28 ports capable of 50 Gb/s bi-directional, 100 Gb/s aggregate bi-directional theoretical bandwidth - Requires one x8 PCI (Gen 3) Express slot (840139-001)