sfp28 is backwards compatible to the other sfp form factors. If you want to connect it to any qsfp connect you will need an adapter like MAM1Q00A-QSA28 NVIDIA DynamiX QSA™ QSA28, QSFP28 to SFP28 Adapter Product Specifications - MAM1Q00A-QSA28 NVIDIA DynamiX QSA™ QSA28, QSFP28 to SFP28 Adapter Product Specifications - NVIDIA Networking DocsI didn't know that SFP28 ports are backwards compatible with QSFP ports.