Clock rates and overclocking reserves
AMD has now managed to do that with the beat really well. The Radeon RX 6900 XT achieves well over 2250 MHz in Full-HD and also WQHD in places, and in places this even goes up to almost 2500 MHz for a short time. Fully warmed up and in Ultra-HD it’s still between around 2150 and 2250 MHz, depending on the game and load. If you increase the power limit by the maximum possible 15%, then the clock rate even goes a bit higher, because it stabilizes up to 2400 MHz and even a bit higher, depending on the chip quality. For a short time peaks of just over 2500 MHz were also visible, but only briefly and only for the gallery. The OC potential isn’t too high, though, as the card already clocks quite high ex works and you can’t always top up the power limit, because AMD restrictively cuts the voltages via the firmware, no matter what you set externally (see chapter power consumption).
GPU and GDDR6 memory temperatures
Now let’s look at the temperatures. AMD still relies on the so-called hotspot temperature internally, but now solves this in a much smarter way with more and cleverly positioned measuring points or sensors. The sum should even reach up to 110°C at the peak, but in practice it was only around 95°C. The “GPU diode” (we also know from NVIDIA), which is internally called the Edge Temperature by AMD, is significantly lower with these values.
I was able to read out the GDDR6 with the help of a special engineering tool. From these individual values the tool then weights the memory temperature, which I have shown you in the graphic. The memory remains, even in the long term, inside (substrate) at just over 82 °C, which is already a slightly higher temperature. The highest readout values are likely to be generated by the two modules that are not directly cooled by the vapor chamber. But that’s just about right.
This is also impressively proven by the IR image, where I intentionally operated the card without backplate this time, since there were many requests for this. The temperatures measured on the board also correspond quite well with what was determined by the sensors.
- 1 - Introduction, Data and Test Setup
- 2 - Teardown: PCB, Power Scheme and Cooler
- 3 - Borderlands 3
- 4 - Control (+DXR)
- 5 - Far Cry New Dawn
- 6 - Ghost Recon Breakpoint
- 7 - Horizon Zero Dawn
- 8 - Metro Exodus (+DXR)
- 9 - Shadow of the Tomb Raider
- 10 - Watch Dog Legion (+DXR)
- 11 - Wolfenstein Youngblood
- 12 - World War Z
- 13 - Power Consumption and Efficiency in Gaming
- 14 - Power Consumption in Detail, Voltages and Standards
- 15 - Transients and PSU Recommendation
- 16 - Clock Rate and Temperatures
- 17 - Fan Curve and Noise
- 18 - Summary and Conclusion
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