Why does the output of lspci command differs when compared between two same hardware?

Solution Verified - Updated -

Issue

  • Why does the output of lspci differs when compared between two same hardware?
  • Why does the output of lspci command does not show Integrated Memory Controller as well as Thermal and RAS registers on one system when compared to other system of same make and model?

Environment

  • Red Hat Enterprise Linux.
  • Lenovo x3850 X6

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