The side bracket in the SYS-421GE-TNHR2-LCC likely houses networking or management add-ons. TheAOM-PCIe card(e.g., AOM-GP401-PCIE module) andAOC NIC card(networkinterface card) are common components in Supermicro’s DLC systems, enhancing connectivity (e.g., high-speed NICs for AI workloads). A (GPU/PCIe) mixes unrelated categories, C pairs an AOM with a GPU (less likely), and D (AOC/PCIe) lacks specificity. B aligns with Supermicro’s DLC networking focus, making it correct.References:Supermicro add-on card specs, DLC system networking components.
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