Relatively new used hardware, a low power dual 10GB FlexLom nic. I used in my dl580 gen9, but if I had another computer that needed a nic I'd consider getting the pcie adapter.
It auto negotiated with my cisco c3750x using a cablematters rj45 SFP+ adapter, and has been running 24/7 since. It supports Jumbo frames and all the features for a smooth 10GB experience.
Work as intended. Only downside I encountered was that when the server is powered off the fans of the server keep on spinning. Although I never encountered this it is an HPE matter (just Google 'hpe fans keep spinning while the server is off'. Other than that, they work great and I have some in reserve.