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

Paul Seelig linux-thinkpad@linux-thinkpad.org
Thu, 13 Nov 2014 16:41:37 +0100

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.

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

These hybrid machines are commonly referred to as "Frankenpad", the
Frankenstein Thinkpad version combining advantages of distinct Thinkpad
generations. See http://thinkwiki.de/Frankenpad for further details.

My personal Frankenpad is internally a T61 with a T9300 Penryn CPU and
2x4=8GB RAM, but contained in a 15" T60 body featuring a BOE Hydis UXGA
(1200x1600) IPS display. The only thing left to do is to replace that
CCFL lit UXGA display by one featuring a LED backlight (the necessary
measures for this are already in progress).

BTW, it is a pity that the international English language thinkwiki
appears to lagging behind so much, while the German language variant is
kept more or less up to date. :(