Test run and temperatures
I reconnect the graphics card directly to the chiller, increase the power target to the maximum 380 watts, the core clock by 200 MHz and the voltage to the adjustable maximum. Then I start Witcher 3 on maximum details at 3840 x 2160 pixels (Ultra HD). The control measurement showed approx. 378 to 379 watts over the measured 30 minutes for the graphics card alone, the water temperature was constant 20°C and the room temperature was 22°C. This gives us the best conditions for later comparisons with other products.
At a GPU temperature of an average of 35°C, I register under the socket on the back of the board approx. 37°C, that's very good. Depending on the positioning, the memory modules are warm between 35°C and 40°C, which is better than both coolers tested so far. The voltage converters are warm to a maximum of 45°C, which is good, but not the best measured value of all previous coolers. Nevertheless, the entire board is cool enough to run through the finish line as the current test winner.
If you want, you can watch the whole thing again as a time-lapse video (x10). It shows very clearly how well the waste heat can be dissipated and that hardly any real hotspots are created:
Summary and conclusion
The Watercool Heatkiller IV is really a chic part, as the mouse does not bite off a thread. In addition to the truly outstanding cooling performance, the price of currently just under 135 euros seems fair, because the competitor products are sometimes even more expensive. Whether you then order the backplate is up to everyone in taste, you don't need it for cooling, because the cooler alone performs well enough, but it looks a little better then.
The bottom line is that Watercool's Heatkiller IV is the previous test winner and also really well processed. However, you should know beforehand that you still have to order thermal paste and also need an H6 hexagonal key. These are the only two small criticisms that I have noticed. However, the whining is at a very high level, because those who screw up water cooling swells generally have everything at hand.
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