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Originally Posted by pHaestus
joemac:
I will, if there is interest, run tests as function of MHz and Vcore using whatever block is on my testbed this week (it's the aquajoe atm). There's a catch though. Can get someone (Les? Incoherent? Groth?) to use results to come up with better radiate-style equations for CPU power using my data?  |
pHaestus, if you come up with the data, I would certainly be happy to give it a shot. I am not a programmer though so it would only be a set of functions which fits your data, in Excel sheet format, not a radiate style program.
Of course this is assuming that we are able to identify and account for all the dominant parameters, at best it would be a "typical" value in a typical system, presented as "CPU power output minus secondary losses" Data at a range of water temperatures would be interesting. I would expect to see a Power/Temperature curve upon which the true CPU power output would lie somewhere.
Les, your C/W vs W chart is very disturbing, I do not like it. I can not imagine a situation where power output is dependent on anything but CPU temperature, applied voltage, speed and load level so I do not want to see anything but noise in such a chart where the above parameters are constant. Flowrate is irrelevant. Anything else, any trend, linear or curve in such data says that there's either a measurement error or in fact one or more parameters are changing. Although of course, in reality all these parameters will change within a certain range, maybe predictably.
Thinking.
Cheers
Incoherent