Hi dietmar,
my hardware is ibm system x3850 m2. On board i have two broadcom (bnx2) eth. adapters. Broadcom adapters are perfect. I have problem with quad ports intel adapters. I have two quad ports intel adapters.
lspci -n
00:1c.0 0604: 8086:27d0 (rev 01)
00:1d.0 0c03: 8086:27c8 (rev 01)...