回答“How much ram is enough?”6GB is plenty just for getting on the internet.
回答“PC randomly reboot during gaming (temps are ok)”It could be bad wall outlet, Power Supply Unit (PSU), Motherboard, or RAM. Check for hardware driver updates. The best bet will be the wall outlet or PSU. If you have another PSU try it and if the problem no longer occurs then it is the PSU.
回答“My pc turn off after a "display port no signal" on monitor”(1) Check your display cable for cuts or break. (2) Make sure your monitor is set to the display port you are using for example if you use HDMI make sure in your monitor settings is set to use HDMI as output.