A:Answer Yea, So the Liquid Cooler is the AIO that surrounds the cpu, no it doesn't come with water, which you would never use, it's not an actual liquid cooled pc its just the AIO, you wouldn't need to drain the liquid etc, they last for a long time, Thermal paste you wouldn't need unless you'd want to change cpu and no it doesn't come with thermal paste. MotherBoard has 4 slots, it can take upon another 16gb or any size of ram that you need I do know that the motherboard withholds the speed of ram at default at some MHZ, But in short yes the Ram can be upgraded to either additional size or to a different brand etc. It's really simple and easy, this PC is extremely upgradeable.
With all.
Seth.