How to test power consumption

What you need is a power meter.

Do a google shopping search for 'Power Meter'

This'll give you a reading of the total power draw including the wasted energy your PSU is dropping as heat.
 
As Tealc says, what you need is a plug in power meter. You can get them from DIY shops for around a tenner. Your rig will pull somewhere in the region of 350-400w at full load as a rough estimate.
 

Why the bump? The question has been answered..

powermeter.jpg
 
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Ive just bought one for £9.99, model no.

N35HN 5-Way Energy Monitor

Basically a 5 plug power strip with a monitor built in, went for this as i wanted to be able to measure monitor usage as well as the pc itself.
 
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