Okay i checked the RAM, its not that bad... I found a seller where i can get the ECC Ram for around 20 EUro per 2 GB bar, so thats 320 Euro for the RAM which is imho affordable, i think Apples holy RAM is more expensive (But they always had odd points of view regarding RAM prices, i think if you buy RAM from apple you are really rich.). I think its good to have fault checking because with 16 RAM bars you raise the chances to have a faulty one. I already spent too much time with RAM related faults, i already  have a boot CD with a RAM Test out of my experience.

I plan to use Windows 2003 enterprise server, i got a 64 Bit version, i assume it will run fine with opterons?

I hope the boxed fans will be well enough to cool them enough for a permanent 100% CPU loads, i am unsure about this as no normal server in a business has 100% CPU load, i dont think they really are MADE for that, but i could be wrong.

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