Real achievable clock rates and overclocking
The clock rates and readout are very fancy and time-consuming, which is why I automated it again this time. I logged in all games (WQHD only) and calculated an average for everything, which I first recorded in a table and compared with the Radeon RX 7800XT MBA:
Card | Average in MHz | Maximum boost in MHz |
Sapphire RX 7900 GRE Pure 16 GB |
2387 | 2462 |
AMD Radeon RX 7800XT MBA 16 GB | 2462 | 2546 |
The clock rates of the GRE card are a real disappointment. The OC card is even a good one percent behind the RX 7800XT MBA and over four percent behind an RX 7800XT with factory OC. Together with the reduced memory bandwidth, this also explains the only slight performance advantages. After all, the GRE has 33% more shaders and is also significantly broader in other respects, but simply doesn’t get the performance on the road. I can’t understand what move AMD actually wanted to make here.
GPU temperatures in the case
The differences are not as great as I feared if you use a proper case. In the end, the card doesn’t dissipate much less heat than the XT. If you close the panel, the GPU temperature (edge) rises by 2 to 3 Kelvin, the GDC hotspot rises by up to 3 Kelvin. This is all still in the deep green range and looks better than AMD’s reference XT, even without the vapor chamber. It could even be significantly lower, but Sapphire has opted for a silent mode.
Infrared measurements (heat flow analysis)
Let’s take a look at the gaming loop, as it is barely below the Torture test. We can clearly see that it is warmer below the socket than in the GPU, which is not surprising. Sapphire has designed the fan control very much in the direction of noise minimization, which is acceptable.
- 1 - Introduction, technical data and technology
- 2 - Test setup and methods
- 3 - Teardown: PCB and components
- 4 - Teardown: cooler and backplate
- 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 - Power consumption, transients and PSU recommendation
- 11 - Tmepratures, clock rates and infrared
- 12 - fan speed, noise and audio-sample
- 13 - Summary and conclusion
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