First off I must say, cudos to Tyan for using such high quality photos of their boards. MAN do I wish SuperMicro would take a cue from them and do that, it's so badly needed.As far as I know there is only ASRock, gigabyte, supermicro options...
Was about to say no Tyan etc but just checking the have 4 but this one may be interesting..
TYAN - Motherboards_S5539_S5539GM4NR-D41-2T(BTO)
Has an OCP slot for SAS / network options..
Secondly, I'm not familiar with OCP slots. What add-on cards specifically can be used with them?