Teardown: The cooler
A total of three 9 cm fans (8.7 cm rotor blade diameter) with 9 rotor blades each provide the airflow. The closed inner ring of the propeller is interesting, so that there is less turbulence (and losses) at the openings of the fan. Sapphire deliberately opts for somewhat smaller diameters, because larger 10 cm fans would also significantly increase the card’s installation height.
The cooler of the Sapphire Radeon RX 7900 XT 20GB has a classic design. A massive, large copper heatsink instead of a vapor chamber carries a total of six 6 mm heatpipes made of nickel-plated copper composite, whereby one of them is not continuous in the cooler structure, but rests on the bottom. This is the first time I have seen this in this form. And speaking of vapor chambers, what’s not in can’t be broken. Solid copper can not be filled incorrectly.
The quite dry and slightly crumbly 1.5 mm pads against are okay and quite sufficient. Annoying oiling out is certainly not to be expected here and it is once again noticeable that the board manufacturers have reacted to our criticism of the rather inexpensive pads.
Thermal paste and die
If you are planning to use the card for water cooling, you should definitely use a fairly viscous thermal paste after a rebuild or a reassembly after a teardown, and certainly not a liquid one! Cleaning is similarly problematic as with the RX Vega, because the gaps between the graphics die and the 6 chiplets are quite narrow and the interposer underneath is very sensitive to pressure and tensions. Then, with a bit of bad luck, it cracks faster than you can say pug.
I recommend dry cleaning by rotating cotton swabs and applying as little pressure as possible. Only at the end you can do the fine cleaning with a soft cloth and isopropanol. No matter what you reapply later, no residue should be left in the relevant areas.
- 1 - Einführung, technische Daten und Technologie
- 2 - Teardown: PCB und Komponenten
- 3 - Teardown: Kühler und De-Montage-Tips
- 4 - Summe Gaming-Performance WQHD (2560 x 1440)
- 5 - Summe Gaming-Performance Ultra-HD (3840 x 2160)
- 6 - Details: Leistungsaufnahme und Lastverteilung
- 7 - Lastspitzen, Kappung und Netzteilempfehlung
- 8 - Temperaturen, Taktraten und Infrarot-Analyse
- 9 - Lüfterkurven und Lautstärke
- 10 - Zusammenfassung, Fazit und Verlosung
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