Hi Avalon,
I bought one because a friend of mine wanted my rig - he has nor the time nor the knowledge to build one. I had to buy new components for me: mobo, PSU, CPU (the Opteron).
I decided to give a shot on the Expert, despite the lack of reviews.
I think you are aware that the layout has changed a bit - memory, CPU position - and the PCIex for the video cards are further apart. I didn't see any problems with that. Also SLI works jumperless, but I don't have SLI - no really useful at the moment.
What I can tell you? I installed everything, copied the bios settings from the "older" DFI (there are some new additional settings) and just gave the first try. Windows XP Pro SP2 loaded normally, didn't need to reinstall anything but had to re-activate Windows - which is really a pain in the neck. Had to read the 8 x 6 keys over the tel to the automated bot (internet didn't work), had to repeat again to a real person, explain why I had to activate my Windows again, where I bought it, my underwear color etc etc etc. After 5 minutes, I got the activation key again. Next time I will go with Corp. Copy :disgust:
Back on topic, on my San Diego 3700 I was able to get an extra 100MHz with the Expert (2.8 instead of 2.7 GHz). With the Opteron, I an stuck with 2.6GHz (2.7 didn't work and I didn't try anything between). But I think it is running with a bit less voltage (BIOS options have different values).
Overall, I recommend the new Expert mobo for someone building a new system, but it does not justify you selling your mobo just to upgrade - unless you can easily sell to a friend like I did.
I also didn't have time to tweak the board, DFI Street Forums are a bit slow on this mobo(Angry Games had some sort of problems with DFI staff - some noobs complained about him). I think it has potential to do a bit better but we need to see some reviews from AT or other competent people.
I heard this mobo can do also 4 memory banks with 1T@200MHz, but I don't have the sticks to try. My friend will come near Xmas and will bring his RAM, which is the same as mine. I will try the 1T then.
If you want, I can create a thread and post some pictures. Let me know