Zstream,
We have had a lot of these xw8200's at work the last 3 years and I do know that working with them they felt "snappier" than my X23800 machine at the house. There have been a couple of reasons why Ive been leaning towards the Xeon box:
1. whether it's true for everything or not, the XEOn box felt snappier when I used them head to head back in the day. This was using windows 2003 server and XP 64 on different paired machines.
2. I use Vmware workstation 6 for a lot of admin and development VM's . When I had my single core 4000+ I was happy but needed to run more. Switching to the X2 I like everythign except for the fact that there is a "feature" (read bug) with the sckt 939 X2's (which I have) that results in very unusual performance hits on windows VM's (this was soo not good for me) unless you hard code some switches that basically mean turning of the advantage of dual CPU's in the box.
3. This guy has a lot of RAM in it. Yes it's ECC, but I don't have to buy anymore since it's 8 GB's worth
4. At work we depolyed this workstation with the version of vmware with zero issues.Plus with two hyperthreaded XEONS I do have theoretically 4 CPU's ( well 3 at least) to play with.
now for zstream, I have never used an opteron since we're an HP intel shop now, so I dont know how the opteron stacks up against a 3800, which I could then kind of have an idea of how the XEOns would perform. I would just like to get some opinions on which of the two machines would be better to add more of. I wasnt sure if the Xeons would be slower or faster than the x2