Teardown: The cooler
A total of three 9 cm fans (8.7 cm rotor blade diameter), each with 9 rotor blades, provide the airflow. The closed inner ring of the propeller is interesting, so that less turbulence (and losses) occur at the openings of the fan. Sapphire deliberately opts for slightly smaller diameters, as larger 10 cm fans would also significantly increase the installation height of the card.
The cooler of the Sapphire Radeon RX 7900 GRE Nitro+ 16GB has a classic design. A solid, large copper heatsink instead of a vapor chamber carries a total of five 6 mm heatpipes (XT six) made of nickel-plated copper composite, all of which are integrated into the cooler design. And speaking of missing vapor chambers: what is not inside cannot break. Solid copper cannot be filled incorrectly.
The fairly dry and not particularly oily 1.5 mm pads are fine and are completely sufficient. No annoying oiling is to be expected here and you can see once again that the board manufacturers have responded to our criticism of the rather inexpensive pads. More on this in the material analysis.
Thermal paste and the
If you are planning to use the card for water cooling, you should definitely use a fairly viscous thermal paste and not a liquid one after a modification or reassembly after a teardown! Cleaning is similarly problematic as with the RX-Vega, because the spaces between the graphics die and the 6 chiplets are quite narrow and the interposer underneath is very sensitive to pressure and tension. Then, with a bit of bad luck, it cracks faster than you can say pug.
I recommend dry cleaning using cotton buds and applying as little pressure as possible. Only at the end can you do the fine cleaning with a soft cloth and isopropyl alcohol. Regardless of what you reapply later, no residue should remain in the relevant areas.
- 1 - Introduction, technical data and technology
- 2 - Test s4etup and methods
- 3 - Teardown: PCB and components
- 4 - Teardown: cooler and cleaning tips
- 5 - Teardown: material analysis
- 6 - Gaming-Performance Full-HD (1920 x 1080)
- 7 - Gaming-Performance WQHD (2560 x 1440)
- 8 - Gaming-Performance Ultra-HD (3840 x 2160)
- 9 - Gaming-Performance DLSS / FSR (3840 x 2160)
- 10 - Gaming-Performance FSR3 Frame Generation (3840 x 2160)
- 11 - Latenzen
- 12 - Power consumption and balancing
- 13 - Transients and PSU recommendation
- 14 - Temperatures, IR analysis and clock rate / OC
- 15 - Fan curves, noise and audio sample
- 16 - Summary and conclusion
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