[PLUG-TALK] Laptop Memory Question

Tony Rick tonyr42 at gmail.com
Wed Mar 30 16:46:28 PDT 2011


On Thu, Mar 10, 2011 at 3:45 PM, Keith Lofstrom <keithl at kl-ic.com> wrote:

> On Thu, Mar 10, 2011 at 03:08:51PM -0800, Paul Heinlein wrote:
> > Assuming you're running Linux, run the dmidecode utility and look for
> > the section called "Physical Memory Array." There will be a field
> > labeled "Maximum Capacity" that will tell you the overall maximum RAM
> > your system can hold.
>
> The  dmidecode  utility is cool to learn about.  But, when I run it
> on my laptop, it says:
>
> Physical Memory Array
>        ...
>        Maximum Capacity: 2 GB
>        ...
>
> I am currently running with 3 GB.  I know the machine won't take
> 4 GB.  The reported number is the "official" number for a Thinkpad
> T60, which is often lower than what actually works.
>
> On the other hand, aren't there are memory limits for 32 bit linux?
> Or at least some magic needed for grub.conf?  Any issues with suspend,
> when the RAM gets large?
>
> Keith
>
> --
> Keith Lofstrom          keithl at keithl.com         Voice (503)-520-1993
> KLIC --- Keith Lofstrom Integrated Circuits --- "Your Ideas in Silicon"
> Design Contracting in Bipolar and CMOS - Analog, Digital, and Scan ICs
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3G limit in Thinkpads T60 and T60p is a chipset limitation.  I did some
digging on this  a while back.  Lenovo official doc says:

Maximum memory capacity may require the replacement of standard component
> with largest supported component available. On ThinkPad systems with an
> Intel 945GM, 945PM, GM965, or PM965 chipset, even though it is possible to
> physically install 4GB of memory, the actual amount of memory addressable by
> an operating system will be limited to 3GB. This limitation does not exist
> with the Intel GM965 and PM965 with the 64-bit operating systems Windows XP
> Professional 64-bit and Windows Vista 64-bit Editions.


-- 
- tony
"I come from the nowhere, I go to the noplace, und here I am!"
Aladdin and His Wonderful Lamp (Popeye, 1939)
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