Mikrotik SFP+ DAC Problem

Hello
I try connect my CSS326-24G-2S+ to server with intel 82599 card with help of S+DA0001 (SFP+ DAC) cable but it did not work.
I try to do it with two different DAC cable and two different intel cards.
My question is if SFP+ DAC cable compatible with all network cards ?
Also if I try to connect two CSS326-24G-2S+ with help of DAC, I get only 1Gbit not 10Gbit speed (some similar question http://forum.mikrotik.com/t/swos-2-6-crs-and-10g/113650/1).
I have SwOS ver. 2.6

Thank you in advance.

Did you get a solution to this issue?
I am having trouble with SwOS 2.12 and a Intel 82599 card.