Teardown: The cooler
This time I analyze the cooler a little more closely. In contrast to the RX 7900XT(X), it no longer relies on a massive vapor chamber, but on a massive copper heatsink (we’ll see in the analysis in a moment). This pays off, because there is no need for filling and mechanically you can hardly do anything wrong. However, as we will see later with the temperatures, this is completely sufficient. The memory is connected directly to the heatsink, which in turn rests on a cast aluminum body that acts as a housing and supports the fans.
We see an approx. 2 to 2.5 µm thick nickel layer on the heatsink before we come across the pure electrolyte copper. There is nothing more to say about the material than that the heatpipes have been brazed on the back.
The white body was coated with the same paint as the five 6 mm heatpipes made of copper composite material. Here, too, we can see the thick layer of titanium oxide paint, which is up to 3 µm thick in places and covers the nickel-plated copper of the heatpipes. The titanium oxide and titanium residues after the end of the nickel layer are deposits from the previous plasma of the laser shots. After the 18th shot, however, these residues are also history.
Now we come to the thermal paste. PowerColor finally uses high-quality phase change pads instead of the annoying sour cream of days gone by. If we drill into the depths with the laser, we find a good conductive mixture of well over 70% fine, dark corundum (Al2O3) and only 20 to 30% finer zinc oxide flakes as filler (lighter particles).
The width analysis with a matrix of measuring points finds predominantly Al2O3, so that the actual contact surface is bonded with highly conductive corundum. Even though these pads are usually thicker than thinner thermal paste, the good surface bonding is well suited to the hotspots. This can hardly be done better using conventional methods.
The pads for the memory are ok, but not premium class. Corundum and more viscous silicone with organic side chains.
The very soft, foamed pad of the voltage converters is somewhat oily but still from the better category. And this time it is not a cheap zinc-silicone paste, but relies exclusively on neat Al2O3 particles next to the silicone. So you can leave that alone.
And what else is in the pad on the coils apart from a lot of air? The superficial traces of aluminum have also been confirmed in depth, but cheap zinc oxide is missing. The dark pad is bound with a lot of viscous silicone, which in turn contains traces of carbon, so that one could think in the direction of silicone rubber. That’s how it feels. So it’s less of a heat-conducting pad and more of a vibration-inhibiting pad.
- 1 - Introduction and technical data
- 2 - Test system in igor'sLAB MIFCOM-PC
- 3 - Teardown: PCB and components
- 4 - Teardown: Cooler and material analysis
- 5 - Gaming-Performance in Full-HD (1920 x 1080)
- 6 - Gaming-Performance in WQHD (2560 x 1440)
- 7 - Details: power consumption and load balancing
- 8 - Transients and PSU recommendation
- 9 - Clock rates, temperatures and infrared analysis
- 10 - Noise level and fan curves
- 11 - Summary and conclusion
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