[ltp] X60s 4 GB RAM PAE only 3 recognized (64 Bit)

Uwe Brauer linux-thinkpad@linux-thinkpad.org
Fri, 14 Nov 2014 09:12:32 +0100

>> "Paul" == Paul Seelig <pseelig@rumbero.es> writes:

   > On 11/13/2014 09:41 AM, Uwe Brauer wrote:
   >> Now I upgraded again to 4 GB RAM, but even with PAE enabled only 3 are
   >> recognized. 
   >> Would it help to upgrade to a 64 bit version of Ubuntu?
   > The X60s is a variant of the X60, which in turn is based on the same
   > chipset as the T60 Thinkpad generation. The chipset used in this
   > Thinkpad generation is only capable of addressing a maximum of 3GB RAM.

   > This is a hardware imposed limit which cannot be circumvented by any
   > means, e.g., installation of a 64bit OS. See the more up to date German
   > http://thinkwiki.de/X60 for further details.

Thanks for pointing this out. I must say the switch from 2.5 to 3 did
not cause any notable performance burst, however I replaced my HDD by  a
SSD and this was a big performance improvement. I will add the relevant
information in the thinkwiki you just mentioned.
   > While this is very unfortunate, for T60 machines it is possible to
   > replace the mainboard with a T61 variant, which easily supports up to
   > 2x4=8GB RAM. http://thinkwiki.org/wiki/Unofficial_maximum_memory_specs

But isn't it very expensive (and complicated) to replace a mainboard in
a thinkpad?.