Real achievable clock rates and overclocking
The clock speeds and readout thing is arg Fancy. I have coupled my own PDM with HWInfo64 for this, because most tools don’t show the frequencies correctly. AMD talks once about the much lower GPU clock and once about the so-called GPU front-end clock, which should be something like an effective clock. Thanks to the higher power limit, the peaks of the Sapphire Radeon RX 7700 XT Pure 12GB are higher than the ones I measured with the MSRP card and thus, in total, the Sapphire Radeon RX 7700 XT Pure 12GB is a bit faster because it is more constant. But it’s only a few percentage points, which also correspond to the slightly increased power consumption.
Without OC, even a bit over 2850 MHz is possible – in the peaks, but with full warming. With overclocking and maximum power limit it goes up to 3 GHz – not bad, but not really necessary. After all, you don’t have to animate the card to binge. However, the cooler manages it, which is good to know.
GPU temperatures in the case
The differences aren’t as big as feared if you use a decent case. Because in the end, the card doesn’t convert much more waste heat than the predecessor models. If you close the panel, the GPU temperature (Edge) increases by up to 3 Kelvin, the GDC hotspot increases by up to 5 Kelvin. This is all in the deep green range and looks good, even without vapor chambers.
Infrared measurements (heat flux analysis)
First, let’s look at the map after about 30 minutes of idling: no real hotspots, which is very good. The hotspot visible here is the SSD case of an NVMe behind the slot.
Let’s start the load measurement with the gaming loop and we see that it gets there below the socket with the GPU edge temperature, which is not surprising. Sapphire has designed the fan control to be very responsive, which we’ll take a closer look at in the next chapter.
The temperatures increase a bit in the stress test, but what we just wrote also applies here. Balancing act between cooling performance and fan noise.
- 1 - Introduction, technical data and technology
- 2 - Test setup and methods
- 3 - Teardown: PCB and components
- 4 - Teardown: Cooler and material analysis
- 5 - Gaming-Performance Full-HD (1920 x 1080)
- 6 - Gaming Performance WQHD (2560 x 1440)
- 7 - Details: Power consumption and balancing
- 8 - Transients and PSU recommendation
- 9 - Temperatures, clock rate and thermal imaging
- 10 - Fan curves and noise
- 11 - Summary and conclusion
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