If someone wants to buy additional 10G card, and has ~300 USD to spare I suggest Intel E810 series. The cheapest E810 version is, I believe, E810-XXVDA2 which has 2x28Gb SFP ports (so good for the future), and uses PCIE4, which makes it work with 10Gbps bandwidths even in x1 ports (though the card is physically x8 in size, so you need an open x1 port), and sometimes you have just a lonely x1 on your MB if you use the rest for 3 gfx cards for god-knows-what purpose :)