I'm converting old Windows desktop machines from 2005-2009 into cheap Ubuntu Linux servers. I want to know which ones can handle a 64-bit OS and which can't. I read that some x86 CPUs are 64-bit compatible. The question is how to check.
The definitive method:
- Download CPUZ
- Install and run it
- Check the "Instructions" value for EM64T (if Intel) or AMD64 (if AMD).
Run this utility and check the field "Maximum Bit Length"; it will show either 32 or 64. This utility is mainly used for checking if your CPU supports hardware virtualization, but it can be used for this purpose as well.