Ubuntu: How can I tell if a machine has PAE?



Question:

I want to help someone upgrade an oldish laptop from 11.10 to 12.04, which requires PAE. I am not sure whether they have PAE or not.

I know it is likely that they do have it after all, but how can I tell before trying to upgrade?


Solution:1

Citing https://help.ubuntu.com/community/EnablingPAE:

To check if your processor supports PAE, try

grep --color=always -i PAE /proc/cpuinfo  

If it outputs something, you have PAE support. Otherwise, the output will be empty.


Solution:2

Another option (which uses a GUI) involves using Hardinfo (System Profiler and Benchmark.

  • Under devices, select Processor.
  • From here, you can see the processor's capabilities (along with their simple descriptions).
  • If PAE is not listed, your processor does not support it.

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  • As you can tell, the processor in this example does not.

enter image description here

  • and this one does.


Solution:3

From the terminal, simply type the following.

cat /proc/cpuinfo  

Scroll down and check the flags. PAE will be listed in the flags if supported.


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