Did you try with the full string? While ACPI is enabled?
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acpi_os_name="Microsoft Windows NT"
I'm still a beginner with Linux and was not able to work on the DSDT solution because I can't find any file by that name (maybe due to disabled ACPI)?
Pretty sure ACPI has to be enabled, but it has been a long, long time since I had to mess with DSDT tables. Pretty sure you have to either rebuild the kernel too ( maybe not anymore? Take a look through the arch page ). Also look into checking voltages on the CPU power, it isn't as likely that it is a power supply issue as it's occurring on three machines, but it also isn't impossible.
As a last thing, I seem to have a vague feeling that I remember some of these types of errors were from either multi-processor support OR hyperthreading. I would first disable hyperthreading in the BIOS, then boot with ACPI on to see if the issue goes away, and then if it doesn't disable multi-processor support and try again. That will help narrow the issue down a bit.
If the server isn't doing anything too intensive you may get around the issue by keeping one or both of these settings disabled and running on a single core.
fortune -o
Your love life will be... interesting.
How did it know?
The U.S. uses the metric system too, we have tenths, hundredths and thousandths of inches