Trouble with new poweredge 2950

I just got a PE 2950 and I'm having some problems.

I installed 6.2PRE and it went well. The first thing I noticed is that
immediate as BSD start to load, a bold/highlighted message says "768xxx
bytes above 4G ignore" or something like that (don't recall what xxx was.

Next thing I noticed whilest trying a buildworld against the latest stable
sources. My system detects 8 cpus. It actually only has 4 - 2 dual core
xeons. I'm guessing that the others are from hyperthreading, but I'm not
certain. Hyperthreading is disabled by default, I believe. So, in the
process of make buildworld -j 32, I noticed that only even numbered CPUs
are being used (0,2,4,6). Is that because BSD is ignoring the HT CPUs,
which would be 1,3,5,7? top and iostat both show that I was never able to
exceed 50% overall CPU usage. Is that because even though I have the HT
representations disabled, the OS is using their availabilty in calculating
% idle time? Is there any way to get an accurate number? The PE doesn't
let me disable HT, I don't believe.

Finally, after the upgrade, I'm having a problem with the system hanging
on startup right after the firewall message, and sometimes right after the
CD ROM detection message. I believe that the SAS controller is supposed
to be detected next, and I'm assuming that's the problem. When I first
tried to install, I used 6.1, and it completely didn't recognize my SAS
controller. I found a message in the archives that suggested trying the
latest stable source, so I tried 6.2 and it worked. Any ideas what could
be causing the problem? When I was using the 6.2PRE ISO, I had to restart
a few times before it got past that stage also.

Thanks much!

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