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TDP Calc

post #1 of 10
Thread Starter 
I did a calc, with watts and ampers:



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Edited by JulioCesarSF - 3/9/13 at 9:59am
post #2 of 10

Am I reading this right?  +12V capacity of 598W for a single GTX 680?  If so, then I am posting to say that this is extremely incorrect.

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post #3 of 10
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Am I reading this right?  +12V capacity of 598W for a single GTX 680?  If so, then I am posting to say that this is extremely incorrect.

Look Gpu count, i put 2.And TDP 155%. thumb.gif
post #4 of 10
Nice, I'll have to check it out.
For older cards there isn't really a way to know the TDP % when overclocked, not sure if there is a way to calculate it in with clock/voltage input?
    
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post #5 of 10
Quote:
Originally Posted by JulioCesarSF View Post


Look Gpu count, i put 2.And TDP 155%. thumb.gif

 

Oh wow, I must not have been fully awake or something.  Thank you for showing me!

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post #6 of 10
Thread Starter 
Quote:
Originally Posted by FtW 420 View Post

Nice, I'll have to check it out.
For older cards there isn't really a way to know the TDP % when overclocked, not sure if there is a way to calculate it in with clock/voltage input?

I'm getting there, a calculation is somewhat complex and not know if it will still leave the paper.

eg.

It seems to me that ati / amd has an option to increase the driver via tdp in 20%, and there are boards that allow higher numbers as the lightnings with 300%.

I'm not the engineering or something, so I'm taking a while to understand the formulas and their Calculations.

Any idea is welcome.

I'll probably add CPU tdp. Despite being much more variable in this case, I believe it is also useful.
Edited by JulioCesarSF - 3/11/13 at 7:22pm
post #7 of 10

IMO-

 

This calculator can be pretty worthless if you ask me.. its in no way accurate..even if your on air cooling, temps increase with clocks and volts.. which increases resistance more. The only way to apply what its providing you.. is if you could keep a CPU/GPU at one temp for idle/load as you increased voltage and clock speed... THEN it may provide some usable information.. as your TDP is not a constant.. it fluctuates with temps conditions.

 

 At best, its a "guesstimate, at nominal temps" .. but in no way accounts for increased resistance and current draw at higher temps... nor does it account for 'superconductor' phenoms, at sub-zero temps. A 6ghz CPU does NOT draw the figures its stating... same can be said for a CPU at stock vcore and 100c.

 

 

**now maybe an idea - give the program a 'tolerance' for an allowable temp window... like within +/- 10c.. etc. Or maybe there is some way you can formulate amperage rise under different temp conditions..generic like?


Edited by CL3P20 - 3/21/13 at 9:54am
post #8 of 10
Thread Starter 
Quote:
Originally Posted by CL3P20 View Post

IMO-

This calculator can be pretty worthless if you ask me.. its in no way accurate..even if your on air cooling, temps increase with clocks and volts.. which increases resistance more. The only way to apply what its providing you.. is if you could keep a CPU/GPU at one temp for idle/load as you increased voltage and clock speed... THEN it may provide some usable information.. as your TDP is not a constant.. it fluctuates with temps conditions.

 At best, its a "guesstimate, at nominal temps" .. but in no way accounts for increased resistance and current draw at higher temps... nor does it account for 'superconductor' phenoms, at sub-zero temps. A 6ghz CPU does NOT draw the figures its stating... same can be said for a CPU at stock vcore and 100c.


**now maybe an idea - give the program a 'tolerance' for an allowable temp window... like within +/- 10c.. etc. Or maybe there is some way you can formulate amperage rise under different temp conditions..generic like?



Never said that the result is absolute.

Give me a formula that calculates the temperature x watts.

I'm not talking about throttling here.

Omg.
post #9 of 10

im not talking about throttling either..

 

 what i am referring to is the current draw required at different temps... if you monitor amperage from CPU at room temp vs. 100c vs. -100c the amount of energy required varies greatly. 

 

 Your program accounts for the increase in clocks and vcore.. but not the increase in amperage at said temp. Without accounting for this your 'TDP' estimate will only be accurate at one temp.

post #10 of 10
Quote:
Originally Posted by CL3P20 View Post

im not talking about throttling either..

 what i am referring to is the current draw required at different temps... if you monitor amperage from CPU at room temp vs. 100c vs. -100c the amount of energy required varies greatly. 

 Your program accounts for the increase in clocks and vcore.. but not the increase in amperage at said temp. Without accounting for this your 'TDP' estimate will only be accurate at one temp.

It is more for the mainstream crowd, the air & water coolers don't really go too overboard, but it does make it easier to see that a 600W PSU actually isn't eough for well overclocked sli 680s.
Looking at the TDP limit of 300 it doesn't go far enough for extreme cooling & overclocking with at least some cards.
    
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