Crucial also has a nice utility that you can use to verify that your laptop can support that much RAM, and specifically which type.  I recently bought a laptop with 4GB of RAM thinking I could upgrade easily. Once it arrived I found that the motherboard didn't support any more than 4GB.

http://www.crucial.com/systemscanner/


> Date: Fri, 22 Mar 2013 17:40:44 -0700
> From: kevinbrownbdc@gmail.com
> To: plug-discuss@lists.phxlinux.org
> Subject: Re: (OT) Sources For Laptop Memory Upgrade
> 
>   Newegg,
> http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007609%20600006176&IsNodeId=1&name=200-Pin%20DDR2%20SO-DIMM
> 
> Crucial,
> http://www.crucial.com/store/listmodule/DDR2/list.html
> 
> your local Fry's Electronics
> http://www.frys.com/search?cat=-69572&pType=pDisplay&fq=100511%20DDR2-100512%20PC2__6400_/_800MHz-100516%20SODIMM
> > I need to upgrade the ram in my laptop (which runs Debian, so this is 
> > sort-of on topic). I haven't bough RAM in a long time, so any suggests 
> > on where to shop? I am looking for 2 X 4GB 800MHz PC2 6400 DDR2 
> > Non-ECC CL5 200Pin SODIMM. Local or Internet, just looking for a 
> > reliable product at a good price.
> >
> > Thanks,
> >
> > Mark
> >
> >
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