SATA port multiplier recommendations?

[dieterbsd at engineer.com]

>> Does anyone have recommendations for/against specific SATA port
>> multipliers?
>> Do they all work well with FreeBSD?
>
> Afaik port multipliers are unsupported by FreeBSD. You are talking
> about controllers?

Beginning in 8.0, port multipliers (and NCQ) are supported by ahci(4) 
and
siis(4).

>> I was hoping someone would have a port multiplier with a 600 MB/s
>> uplink
>> by now?
>
> It is possible with LSI 3081e (mpt).

Huh?

LSI 3081e appears to be a 300 MB/s 8 port SAS controller that requires
at least an 8 lane slot.  Not going to fit in my wimpy x1 slots.
The mpt(4) man page doesn't appear to mention NCQ.