My server is a HP ProLiant MicroServer Gen 8 orginally shipped with in a G1610T configuration. I have upgraded the processor by a [https://ark.intel.com/products/65734/Intel-Xeon-Processor-E3-1220-v2-8M-Cache-3_10-GHz Xeon E3-1220v2] I was hoping to find a refurbised [https://ark.intel.com/products/65735/Intel-Xeon-Processor-E3-1220L-v2-3M-Cache-2_30-GHz E3 1220L to reduce power consumption, yet those are still a bit costly.

Upgrading the processor requires firmware upgrades of the server:
  - https://homeservershow.com/blog/hp-microserver/hp-proliant-gen8-microserver-xeon-e3-1265lv2-cpu-upgrade/
  - https://www.hardwareluxx.de/community/f101/hp-proliant-g8-g1610t-g2020t-i3-3240-e3-1220lv2-microserver-963207.html

Attached the required firmware files to be installed via iLO with processor support and hardware service manual with instructions to replace CPU.