In my T60 (same chipset IIRC), matched RAM gives about a 10% speed boost in memory-intensive tasks, but I have 2.5GB in it now (2GB + .5GB). I second George's recommendation to run memory tests such as http://www.memtest.org/

Chris

On 10/12/2011 08:20 PM, [email protected] wrote:
I don't believe that you're on the right track here.
?
Having owned numerous ThinkPads (including all varieties of X60) with the 
chipset in question, I will state that they work with no issues with 2+1GB, 
1+0.5GB, 2+0.5GB as well as 2x1GB and 2x2GB.
?
I believe that you have a defective RAM stick, or slot or another hardware 
issue altogether. Running a memtest 86 on one stick at the time, one slot after 
another would be a good start.
?
While you can physically install 4GB and have BIOS recognize it, only 3GB will 
be usable due to a chipset limitation, regardless of OS used.
?
Proper RAM for these machines is PC2-5300 667Mhz.
?
Good luck.
?
Cheers,
?
George




-----Original Message-----
From: Willy Theodorus<[email protected]>
To: Thinkpad Mailing List<[email protected]>
Sent: Wed, Oct 12, 2011 7:59 pm
Subject: [Thinkpad] RAM issues on Thinkpad X60s




I have issue with ram installed in my thinkpad x60s, running windows7 32bit.

I upgraded my x60s' ram to 3gb, which each slot 1x1gb and 1x2gb, both are
PC2-5300 DDR2 SDRAM SODIMMs, and it starts to hang after a lot of programs
opened.

I've browsed and found that Intel 945 would only works with balanced ram for
both slot, and for using 2gb ram, should use PC2-4200.

  I want to use 4gb ram in total, which I except the consequences of available
only 3gb on 32bit system.

My questions are:
1. Can my x60s hold a 4gb ram?
2. Should I installed 2x2gb PC2-5300, or 2x2gb PC2-4200?

Thanks.
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