What hardware do I need to buy

This one is really great, but too expensive for me, I am just using X520-DA2 only.

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Ya got that right, I picked up an X520-DA2 on ebay for $80 including shipping. Stuck it in the NAS, plugged in a $15 DAC, off to the races! The Linux drivers for it are super solid.

If you don't need 2.5 or 5 gbit, the Broadcom 57810S dual port 10GbE cards are often less than $30 on eBay.