Comment 8 for bug 1170087

Joshua Kugler as per your :
[ 0.000000] AMI BIOS detected: BIOS may corrupt low RAM, working around it.
...
[ 0.000000] Your BIOS doesn't leave a aperture memory hole
[ 0.000000] Please enable the IOMMU option in the BIOS setup
...
[ 12.643794] EDAC amd64: f10_probe_valid_hardware() This machine is running with DDR3 memory. This is not currently supported. DCHR0=0x3f48090d DCHR1=0x3f48090d
[ 12.643797] EDAC amd64: Contact 'amd64_edac' module MAINTAINER to help add support.

Hence, as per http://www.supermicro.com/support/resources/results.aspx an update is available for your BIOS (r3.0b). If during your maintenance window, you update to this following https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it doesn't, could you please both specify what happened, and just provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette .

Thank you for your understanding.