The effective thermal conductivity
As of today, you will also only find interactive charts here, and I have already written everything you need to know about how to use them on the previous page. And if you already have Rth, you don’t really need λeff, i.e. the effective thermal conductivity. Please remember the possible anomalies I mentioned and also see how the values change over the BLT.
Of course, the whole thing is also shown again as a bar chart for the four most important layer thicknesses:
Apart from the fact that I also have the temperatures of the heater and the water, which are of no use to us because they either adapt to the resistances or always remain constant, I have my measurement setup with the temperature sensors 1 to 6 (see diagram on page 2). These values can also be used to make some very interesting considerations.
Memory emulation vs. real-world test
Now I compare T3 of each of the tested products. If we normalize the values for the heater, we already have sufficient thermal resistance in the copper reference block to simulate the memory temperature and its differences with different putties in comparison with each other and depending on the layer thickness of the putties as a pad replacement. It is precisely this variable evaluation that no test on a graphics card can offer, because the respective cards from different manufacturers also use different pad thicknesses and it is therefore not really reproducible. In the TIMA5 test, however, it is, because I can measure all distances, which is simply not possible on just one graphics card.
Nevertheless, we want to know whether the whole thing is comparable with reality. For testing purposes, I’m using a cheaper and somewhat outdated RTX 3080 Ventus with GDDRX6, which of course needs to be cooled. Compressed together, that’s around 1.75 mm to 2 mm, so I’m comparing the two, i.e. simulation vs. graphics card. Measurements were taken after 15 minutes of Furmark Extreme and without a backplate.
We can see that the differences aren’t that big, but the 6 Kelvin difference between the cheap HY 234 and the Extreme64 can of course not be ignored. The HY 236 performs almost as well as the Extreme 64 both in the simulation and in the real test, hats off.
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About the author
Igor Wallossek
Editor-in-chief and name-giver of igor'sLAB as the content successor of Tom's Hardware Germany, whose license was returned in June 2019 in order to better meet the qualitative demands of web content and challenges of new media such as YouTube with its own channel.
Computer nerd since 1983, audio freak since 1979 and pretty much open to anything with a plug or battery for over 50 years.
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