Guide to PCIe Lanes: How many do you need for your workload?
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ASMB-923I-00A1E | Dual LGA 2011-R3 Intel Xeon E5 EATX Server Board with DDR4, 6 PCIe x16/x8 by Advantech - L-TronDirect
What is PCIe (Peripheral Component Interconnect Express)?