Maxmimum RAM for FC3

Dave Jones davej at
Mon Dec 19 16:06:06 UTC 2005

On Mon, Dec 19, 2005 at 10:47:01AM +0100, luca porcu wrote:
 > 32 bit  = 2 ^ 32 MB of RAM 4096MB is the max of RAM for CPU at 32bit!

Except with PAE (Physical Address Extensions), the CPU is effectively
36 bit.  Giving a theoretical address range of 64GB.  In practice
however, once you go past 4GB, your low memory region (0->896MB)
becomes filled very quickly with structures that _have_ to live
in that range, and all sorts of problems can occur (typically page
allocation failures, oom-kills).

If you need > 4GB, I really recommend going to x86-64.


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