I found good advice while googling the item:
ad_select=bandwidth xmit_hash_policy=layer2+3

This killed any difference in motherboard behavior - both Intel and
SuperMicro now look the same.
Nice balancing for parallel reading or writing - both interfaces are
But when one client is reading and another - writing, the traffic from
both of them goes through one LAN interface.

andy_s's Profile: http://forums.novell.com/member.php?userid=67489
View this thread: http://forums.novell.com/showthread.php?t=446442