51c Is a safe temp for just about anything, I wouldn't worry about it unless it got higher than 60C. If you really want to make it colder you can re-apply the thermal paste.
hey this is my first time and is 51 degrees celsius too hot for browsing the net
What processor do you have? And are you using the stock cpu cooler that came with the processor? 51 Celsius is a little warm, but that could be due to multiple things.
51c Is a safe temp for just about anything, I wouldn't worry about it unless it got higher than 60C. If you really want to make it colder you can re-apply the thermal paste.