Laptop staying very hot on Arch Linux

Hi,

I installed Arch Linux on my laptop (Core i7 Sandy Bridge), and I' m noticing that CPU is running much more hotter than Windows 7. On Windows 7, the same machine runs on 50° C, but in Arch Linux it runs on 65° C, and the fan stay blowing air permanently (while on Windows it stays really quiet).
I changed the CPU frequency governor to ondemand and accepted all the tips from powertop, but the temperature stays high. There is no process using 100% of the processor.
Is there anything that I could do?

Please help.

I didn' t find the right solution from the Internet.

References:-
https://bbs.archlinux.org/viewtopic.php?id=132102
Operation Management Service Video

Thanks!