A:Answer The computer fans aren't loud at all and I don't hear them really at all, unless you plan on staying on your Lenovo desktop for more than about 3 hours you will hear at least something. And as far as I know about upgrading it, I'm currently only upgrading the ram. You can only fit 32gb of ram, and can only have 1 stick of GB of ram per slot. The computer can only hold about 250W of power supply so you cant really upgrade your graphics card.