As opposed to the usually used Intel solutions (X520-SR2/DA2), this card simply works in both Linux and Windows environments and with non-server products (e.g. Sabertooth X99 with i7-5820k). It also works with any 10 G transceiver I had thrown at it - and it works reliably whilst consuming less power than Intel.
Tested and works great with FreeNAS 11.3 builds too.
Highly recommended.