>> with every other OS it isn't detected at all (not detected as PCI device at 
>> all, not just no driver)!
>> 
>> magic? maybe but i will ask on FreeBSD groups.
>
> Is the NIC attaching at an IRQ greater than 15, BTW?  If so, you might even

yes. it has 3 PCI busses: one for builtin on-chipset devices, second for 
AGP, third for PCI slots.
> have more than one PCI bus running and have PCI-PCI bridges present:
>
> For example, a Dell PE2950 box below has the integrated Intel NIC (em0) at 
> irq64:
>
> Anyway, without ACPI and the APIC enabled, your AMD64 hardware is probably

i enabled APIC in BIOS.


even more funny - last version of FreeBSD detects built in nVidia 
ethernet, while everything else (including Windows XP PRO X64) doesn't see 
any device at all, not just device without driver!

motherboard is brand new - can it be broken somehow? FreeBSD-current 
showed that hardware is OK, ethernet works just fine. so what is wrong? 
people use this hardware with windows for sure.