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Elite 8300 CMT - Bios 3.08 - no boot with additional Ethernet card

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ELite 8300 CMT

Hey Guys,


I am trying to repurpose a couple of Elite 8300 units with the I5 processor as a home lab for running xcp-ng.


I have updated to the latest BIOS 3.08 as of August 2020.


THe systems run fine and install well - however whenever i try to add an additional Intel Dual port Gigabit ethernet card to them - they hang at boot. 


I have two identical systems (and 4 ethernet cards) so i do not believe it is an issue with faulty hardware.


I have tried hiding the onboard card - but makes no difference - the system sits at the initial POST screen and goes nowhere (but funnily enough is not hung as Numlock and Caps Lock both work - any ideas what else i could try to make these cards work ?


I assume as they have the same chipset as the onboard Intel NIC they are somehow clobbering each other ?



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