Scientists have thought that magmas that form new crust at fast-spreading ridges rise up from the depths, quickly crystallize, and then push away from the ridge to form new ocean floor.
To stop a computer from overheating never keep a cloth or something else on the CPU or monitor. Also use the save energy option from properties so as to switch off the monitor when not in use. This will always help in keeping the computer cool and not overheating it.
I bet it is your cpu fan speeding up due to a increase in heat. I am not sure if this is likely but I think the new video card might have stressed your power supply and your power supply is now causing your computer to over heat. Just a guess.The cpu fan will normally rev up when your cpu is getting hot.he problem would be identifying which fan causes the noise. Either CPU fan, chassis fan or even the power supply fan. If I were you I would open my case side door and see what's inside, maybe snap a picture. and then first try to disconnect the chassis fan, since it's the easiest and cheapest to replace.