physical RAM restriction in Fedora 12 (32 bit and 64 bit)
Kevin J. Cummings
cummings at kjchome.homeip.net
Thu Dec 17 18:00:58 UTC 2009
On 12/17/2009 12:51 PM, Mark Ryden wrote:
> Hello,
> AFAIK, in windows 7, **32 bit**, there is a limit of 3GB physical
> RAM which can be recognized by the operating system.
> This means that if you have 4GB of RAM, only 3 will be used.
This is usually a BIOS limitation.
> My question is:
> 1) In Fedora 12 32 bit default installation , does the kernel knows
> more than 3 GB of RAM ? what is the limit ?
The same. It uses what the BIOS tell it is available, unless you run a
PAE kernel. The Physical Address Extensions allow you to address the
full amount of your RAM.
> 2) In Fedora 12 64 bit default installation , does the kernel knows
> more than 3 GB of RAM ? what is the limit ?
64-bit does not have the artificial limitation (the actual limit is
*much* higher than you can currently put in a machine today) that 32-bit
does. You should see the same with Windows too.
> Rgs,
> Mark
--
Kevin J. Cummings
kjchome at rcn.com
cummings at kjchome.homeip.net
cummings at kjc386.framingham.ma.us
Registered Linux User #1232 (http://counter.li.org)
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