Kernel - PAE vs. non-PAE

Robert L Cochran cochranb at
Wed Jul 1 01:40:58 UTC 2009

I'm installing Fedora 11 on a rather ancient Toshiba Satellite 1905-S303 
laptop which ought to be tossed in the trash can, and that has the PAE 
kernel installed, too.


On 06/30/2009 09:27 PM, Steven F. LeBrun wrote:
> When I installed F11 on my Toshiba laptop, it installed the PAE 
> version of the kernel.  I am assuming that my laptop has a CPU with 
> Physical Address Extensions functionality and can therefore address up 
> to 64GB of memory.
> My laptop only has 3 GB installed.  Can anyone explain the pro's and 
> con's of using the PAE version of Linux kernel instead of the non-PAE 
> version?
> Would the PAE version of the 32-bit Linux Kernel see 4 GB of memory if 
> it was installed where Vista 32-bits only sees about 3GB?  For that 
> matter would the non-PAE version see the full 4 GB?
> -- 
>   Steven F. LeBrun
> Quote: /"There are 10 types of people in this world, those that 
> understand binary and those who don't."/

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