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My laptop is Thinkpad T400, and running 64 bit Ubuntu 14.04. I wonder if there is no limit of the RAM size that I can use in my laptop?

Now I am running Windows 8.1 in VirtualBox, which takes 2GB RAM, and if I open 80 Chrome tabs, My RAM (8GB, which is two 4GB RAM cards occupying two slots in the laptop, I am not sure if there are extra slots) will be fully used, and my swap (16GB) will be half full, and the speed is slow because of constant swapping.

I am thinking about upgrade my RAM to a bigger size (maybe 32GB or more). But not sure if there is some limitations on the RAM size, how many RAM cards I could buy and insert into the laptop, and other aspects that I should be aware of. So I appreciate your reply!

Tim
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You can put in as much RAM as your laptop will hold. 64 bit systems have no practical limitations on RAM size. As said above, an SSD will help with your swap speed. Your laptop claims to be able to hold a max of 8gb of RAM. This is likely a limitation of the motherboard, although you can try two 8gb sticks, but no guarantees on that.

In short, it looks like you've maxed out your ram. Get an SSD.

Daniel
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