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Originally Posted by unregistered
oof, who has 0.01°C accuracy ? even that HP 2048A is 0.04 on its best day
also I would never presume that the C/W is the same over a 5 fold range, 100 to 500W
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Hmmm, we see the curves from your testing that the C/W remains relatively fixed across broad heat-load differences...
What are we after here then? For me, I want a fixed way in which to assess relative radiator performances, and if that can be achieved with a certain degree of accuracy with 250-500W heat loads with 0.1C accuracy equipment, as opposed to 50-100W heat loads with 0.04C accuracy equipment, then so much the better.
As for upholding a single absolute testbed procedure against which all other testbeds can be essentially described as being equal, I don't think that's ever going to be achieved. We can already see transparantly through the actions of certain manufacturer's marketing material that there is no interest to ever provide such, quite the opposite in fact.
So in my mind whatever is done, is being done on a per testbed implementation and that's the way it's going to remain unless some testing company starts supplying products like a "Unified Waterblock and Radiator Test Kit", and even then we'll still have various manufacturers preferring to target and sell to the ignorant with trash figures, and they'll still succeed.
At the end of the day, is this concern applicable to the end user, or to internal testing only? If to the end-user, then the measurements as I suggested is going to be most suitable for them, and easier for them to understand and work with. If trying to provide fastidious accuracy and adherence to strictly defined testing guidelines as suits the more rigorous and discerning customer (i.e. NOT PC water-coolers), then ones hands are pretty much tied anyway.
So let's throw it back and ask what are we trying to achieve here, who is the audience, what do they want, what are they (the wider audience) capable of understanding, and what is an acceptable degree of accuracy for them?
Let's face it, if you're a manufacturer and you're adhering to strict testing and measurement guideliness, it's only going to be used against you by the less scrupulous marketeers. You'll say radiator has "XXX" performance, they'll just advertise as "XXX+10%" with no actual proof, but just say all the right words in public to placate the ignorant to get the dollar. You've done all the hard work, they've lied, but who gets the dollar at the end of the day?