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I cant spend hundreds upon hundreds of dollars however i want to have something that will calculate c/w and do it wel enough to be reliable.
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I want the same exact thing! No such critter though. Reliability implies accuracy, and that costs money. You need to measure both voltage and current to a pretty high precision and supply a nice smooth power. This alone will eat up a couple hundred dollars with secondhand equipment (all I use but gotta be careful).
Some observations about waterblock testing from another amateur at this task.
You MUST measure: Flow rate, water inlet temperature, die temperature.
Water inlet temperature must be held constant somehow.
You will probably want to measure: Water outlet temp, baseplate temperature.
You MUST get a reproducible mounting of block (10 reps seems to be pretty representative from Bill's testing). Mounting pressure is part of this problem, paste application and torque from hoses are others.
Look at the errors involved in EACH of your measurements and propagate them forward. With typical cheapo overclocker stuff, the errors in the temps alone is likely 3-4C. What about the error in W? 10%? Now calculate the error in the final C/W you get from those.
If the uncertainty in ONE of the measurements alone is more than the difference in performance of many waterblocks (and it is) then the results you produce are worthless. Well perhaps I am too harsh. They are not at all my definition of reliable. How's that for tact?