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Cheaper to get an Intel copy direct from China: http://m.ebay.com.au/itm/NEW-Intel-X540-T1-OEM-10G-RJ45-1-Po...

(Obviously you don't get the adavantage of long range at lower speeds, but the vast majority of people just want faster data transfer in the same room).

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There seem to be genuine, but used, 10G NICs from many vendors under $40 (Myricom, Mellanox, Chelsio) which might be a cheaper option for a home lab setup. Even 10Gbase-SR SFP+ modules are cheap used, but for a 2 card setup, I'd go CX4 or SFP-DA / Twinax. Most of the failures we see at work in the field around 10GbE or 40GbE hardware is the SFP+ / QSFP modules.

I feel dumb not even having looked whether or not anyone actually produced cloned 10G cards.

Have you had any success with them yourself? Is there any data or resource on how trust worthy these clones are? Tempted to order a couple for testing at home with, at some point...

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