I have a Lenovo Z570 Thinkpad with windows 7. One of my friends suggested that a 4GB RAM is much more effective when working on Linux than on Windows, so I searched a lot and installed Ubuntu 12.04LTS. Now my system fan is running faster and the CPU temperatures increased. Then for a number of days I compared the CPU temperature between Ubuntu and Windows 7: I found that when working on Ubuntu the temperatures are considerably higher even though the %CPU usage is less than 5 in both. Is this normal? Is there any way to reduce the CPU temperature?