Hello,
I noticed that my ThinkPad T61p (Model 6459-CTO) only detects
3070MB of RAM when performing the extended test at POST, but
installed memory in the BIOS reports 4096MB. I have two 2GB
SO-DIMMs from Crucial installed. Swapping the SO-DIMMS makes
no difference.
Motherboard was replaced under EasyServ because of this and I
had some problems running 3-D graphic intensive applications
(appears to be a known issue with the nVidia graphics chip).
Upon its return, I installed a new HDD and loaded Windows 7.
The BIOS Version is 2.26 and the Embedded Controller Version
is 1.08.
Some statistics from Microsoft Windows 7 Ultimate x64:
o The System applet in the Control Panel reports 4.00GB
installed.
o In the Task Manager under the Performance tab, 4030 MB
of Physical Memory is detected.
o In the Resource Monitor under the Memory tab, Physical
Memory is reported at 4030 MB Total, 4096 MB Installed.
Some statistics from a Ubuntu 9.10 amd64 bootable CD:
o 'top' reports Mem: 3993756k total, as do both the 'free'
and the 'cat /proc/meminfo' commands
o 'dmidecode -t memory' detects two 2048 MB SODIMMs
I understand that some memory is lost due to BIOS shadowing,
etc., however, I do not understand why 1GB of RAM is missed
during the extended test. The only time I have seen memory
disappear like this was when an adapter with its own on-board
BIOS firmware mapped itself somewhere into RAM's address
space, but I have not changed any of the mini-PCIe cards in
the system (which are the only things I can think of that
might utilize address space).
The recent discussion of upgrading T61s to 8GB of RAM on the
list has made me interested in pursuing this upgrade, however,
if there is some reason my T61p will only address 3GB then it
seems there would be no value in doing so.
So far, no problems with graphics have been noted, however,
that may take more time to exercise itself, and I need to
re-install some games to verify the fix.
If anyone has any suggestions about how to troubleshoot this
further I would greatly appreciated your comments.
Regards,
Aryeh Goretsky
_______________________________________________
Thinkpad mailing list
[email protected]
http://stderr.org/cgi-bin/mailman/listinfo/thinkpad
