MP 1,1-5,1 Calculating TDP on PSU in Watts using iStat?

[zedex]

I read somewhere that to calculate the Total Power Draw using the 'ampere' read-out on iStat that you take the raw score from the field named "PSU 12V (PSMI)" - in my case 29.28A (see screenshot) and multiply that number by 36 (being 3 x 12V)..

If my calculations are correct then the system TDP = 1054W

Is this a correct calculation?

Is "PSU 12V (PSMI)" a total system power draw calculation..?

 

[h9826790]

No, that equation isn’t applicable for this case.

I was the person who introduced that equation on another thread. Which is to calculate the PULSE RX580’s power draw via the associated PCIe slot measured current.

And this equation is absolutely useless for any other calculation.

Anyway, that’s to calculate the power draw, not TDP.

 

[zedex]

Thanks @h9826790 - is there any app you know of that will tell you how close you are getting to the cMP max power rating (980W if I remember correctly)..

 

[h9826790]

That 980W rating actually can be broke down to

1) 12V x 80A
2) 5V x 5A

So, actually 985W.

Since that 5V x 5A is just 25W, less than 3% of the max PSU output, we may ignore that in this kind of estimation.

So, all we need is just focus on the 12V PSMI output.

~30A means ~360W. So, not even half the 980W.

In fact, there is no need to workout anything. Since we know the max output for the 12V line is 80A. unless you see anything close to 80A, that means you are below the limit.

Also, unless you performed Pixlas mod, and installed multiple high end graphic cards. It's almost impossible to draw anything close to 980W.

 

[zedex]

this is a really good answer - thank you very much