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Silverstone ST45SF-G 450W (12V rail with 37A) with a GTX 760 SuperClocked - Thoughts? - Page 4

post #31 of 33
Quote:
Originally Posted by TwoCables View Post

I know, but is it accurate? That's what I'm disputing.

I understand where you are coming from. It's a new(ish) feature and difficult to corroborate with another measurement.

Consider that accurate voltage and resistance sensors have a much simpler construction compared to temperature sensors. Resistance measurement is not so dependent on good calibration as a temp sensor would. We've trusted the CPU temp sensors for a few years now, we trust the voltage reading (to 3 decimal places) when we overclock, so can we also trust this resistance measurement? I think so yes.

Naturally we can't be sure how the internal circuitry is, but we can assume it's similar to how a ohmmeter works. Have a look at the Kelvin sensing method http://en.wikipedia.org/wiki/Four-terminal_sensing it's a very simple construction that can measure voltage drop between two points. When a known current is supplied across the sensor, this results in a tiny tiny voltage drop and from there we can calculate resistance. In a CPU each section of the circuitry is supplied with its own voltage. So you'd need a Kelvin sensor for each section. Thanks to Ohm's Law: if you know voltage supplied and resistance found, then you can determine current and hence power (watts). The circuitry just needs to measure at each section, and total the results for overall power consumption of the CPU. The sensor holds a cumulative value, plus a time-stamp, so it's effectively showing how many watts total has passed through the chip and over what period of time.
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post #32 of 33

Before I trust it, I'd like to see the results compared to a Digital Multimeter.

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post #33 of 33
Quote:
Originally Posted by TwoCables View Post

Before I trust it, I'd like to see the results compared to a Digital Multimeter.

Where are you going to connect the two probes of a multimeter to get a reading for the CPU only?

I can try it. Asked to borrow an industrial multimeter from the workshop here at my employer. You propose where to connect it, I will measure smile.gif
Edited by WiSK - 3/14/14 at 6:00am
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