Hi,
I've just commited two driver that should make the owners of Dell x950
(and possibly others) happy:
- bmx(4) supports the Broadcom NetXtreme II network controller (BCM5706 and
  BCM5708)
- mfi(4) supports the LSI MegaRAID SAS controllers (which includes the
  Dell PERC 5/e and 5/i, and the Intel SRCSAS18E/SRCSAS144E).

I've lightly tested this on a Dell 2950 with 4GB RAM running i386 and then
amd64.
I've build i386 and amd64 releases with these drivers inclued:
ftp://ftp-asim.lip6.fr/outgoing/bouyer/i386/
ftp://ftp-asim.lip6.fr/outgoing/bouyer/amd64/

enjoy !

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--