Introduction
AMD believes it can easily get over the summer day with the small 120mm radiator of its AiO (Vega Liquid). That you can then then have water temperatures of approx. 60°C (or more) to stay at least reasonably quiet, you can see how you like. But then you certainly hardly have much thermal room for manoeuvre. We will therefore first test what can be achieved with this minimal version and various improvements such as a second fan or a larger radiator.
Our readings do not include the helping backplate of our cooling system, because we had to remove them for the IR images. The difference, if you believe our temporarily plugged-in sensors, is up to 4 Kelvin, which you would be even lower on average for the voltage converters and up to 15 Kelvin for the doubler chips in the maximum OC. We have fixed the fans to 1300 rpm to avoid fluctuations in the measured values from the outset.
120 radiator and one fan (push), Turbo Mode
First, we test a smaller radiator with only one fan and choose the turbo mode with approx. 316 Watt load in the test scene. The result is just acceptable, but if we lower the speeds to 1000 rpm and below, we quickly break the 60°C mark upwards. Cool AND quiet definitely doesn't work here.
The HBM2 memory is unclocked approx. 4 to 5 Kelvin hotter (see curve), on just under 1 GHz then overclocks by up to 8 Kelvin.
The Turbo Mode allows clock peaks up to 1630 MHz, but then brakes again and again up to 1401 MHz. This hiccups are symptomatic of the attempted adherence to the power limit over time. This results in an average clock of approx. 1526 MHz over the entire runtime of 30 minutes.
120 radiator and two fans (push-pull), Turbo Mode
Now we simply pack a second fan to the other side and let it act sucking for support with the same speed. Temperatures drop slightly as expected, but it also gets much louder.
After all, we now make it below the 50°C mark for the GPU with the same power consumption of 316 watts. The HBM2 also gets correspondingly cooler.
Unfortunately, this has almost no influence on the clock rate. We now measure 1528 MHz on average over the 30 minutes, which is almost still in the range of measurement tolerances.
240 radiator and two fans (push), Turbo Mode
Now we simply mount a 240 radiator via quick release and use the same fans at the same speeds. More cooling surface now also brings significantly more cooling performance
The GPU now stays permanently below 42°C, which is certainly a decent performance for AiO cooling in the measured power shots. At 45°C, the HBM2 is also a cooling class in itself.
The average clock now rises to 1535 MHz without us changing the settings. With this you can live commod and it certainly leaves room for good overclocking results in the following. Should at least.
Intermediate conclusion
Boost's clock gain is still significantly lower than current GeForce cards, with falling GPU temperatures. A counter-test with chiller and constant 20°C water temperature did not bring any further improvements below the 40°C mark.
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