I am still waiting for my RAM modules to arrive. I do hope Fujitsu releases a bug-fix soon enough. I have good experience with their hardware, but they do have issues when new releases with new features arrive.
Actually, I am experiencing the same exact situation. When you read the manual, you will see that only unbuffered/unregistered ECC dimms are supported. This is why this Xeon only supports up to 64GB RAM. So do as I have. Order the right kind of DIMMs and you'll be fine.