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The X200 officially only supports 2x2GB, but seems to work fine with 2x4GB, as long as it's the correct type of ram (single-sided if I remember correctly). So I need to find the right type of ram and it's something I plan to upgrade, but didn't get to it yet.

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It is probably better to stick with 2G+4G combination, as in that case it is less picky about the correct type of the 4G module (as in, there are modules that work in this configuration, but not as 2x4G) and IIRC the chipset cannot address the entire 8GB of RAM anyway.

Mine has had 2x4 in it since app. 2010. I tested it in the shop so I knew it worked and right after I walked out of there I called one of my nerdy friends and we talked for a very long time about the an obscene amount of RAM I had.

That machine developed a screen fault later, but I replaced it with another X200, which is still my personal machine. I have a T490 for work and the experience makes me want to stockpile the older models.

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