Hi [NAME] MIS Dept,   Would the ConnectX-6 DX DPN# is 8P2T2?    If yes, then DPN# 3CC35 cable would work on the ConnectX-6 DX and R7525. 
Use case: Cross connecting 2 of these adapters in R7525 servers for iSCSI software san. I understand cabling is a finicky thing with this type of device. Trying to confirm a part number for DAC cables ebtweebn two of these Dell/Mellanox ConnectX-6 DX QSFP56 adapters. QSFP28 seems to be fine and will run at 100GbE so will 3CC35 work?  Thanks! Jeff
Mellanox ConnectX-6 Dx Dual Port 100 GbE QSFP56 Adapters: Cabling