Hello there.
I have 2 CRS326-24G-25 + RM and 2 S + RJ10 products. I have one SuperMicro X540-AT2 10 10g card. I have a Slackware based diskless server. When I connect 10gb with sfp, client computers do not boot without disk. When I plug the cable into the 1 gb port, the computers turn on without any problem. (I had a dell x540 card before and it was running at 10 gb)