best online calculator is this

<br />http://www.hermann-uwe.de/photoblog/voltcraft-energy-check-3000<br />U can't fale with that<br />Also is very intresting new ZALMAN fan controler
http://www.quietpc.com/gb-en-gbp/products/casefanaccessories/zm-mfc2 <br />Real-time display of overall PC power consumption

<br />Shamino (one of the best overclockers in the world) said that ZALMAN ZM-MFC2 is very reliable<br />After all... I believe in HW
