Hello people!

I have a Dell OptiPlex GX260 desktop with service tag number<ADMIN NOTE: Service tag removed per privacy policy>. It is a refurbished PC which my sister bought from our office many years ago. Just want to ask what is the maximum RAM that it can be upgraded to? When I was browsing its manual years ago, if I'm not mistaken, I've read that its maximum RAM is 2 GB. But I'm not sure if my recollection is right. I'm planning to upgrade its RAM and I want a little higher than 2 GB. For example, if I upgraded its RAM higher than 2 GB (if its the correct maximum RAM for my model), what will happen? Will it damage something on board? Or will it make the system unstable?

Thanks.