Zalman ZM-PCM1 / ZM-VPM1 CPU AND VGA Power Consumption Meters Review
 

All-in-all, Zalman has targeted a relatively limited niche of PC enthusiasts with these products. If you're the kind of user who demands the kind of information that these devices can provide, I'm unaware of any other options that are this easily installed. They are also well executed and attractive additions to the front panel that work as advertised. Just be aware of their limitations.

http://www.tweaknews.net/reviews/zal...m-vpm1_review/