Power consumption in factory state as summary
Let’s start with the Radeon RX 7900XTX. The 38.5 watts at idle are disproportionately high, fluctuating between 19 watts and up to 50 watts. With a second monitor, this quickly becomes 70 watts and more (peaks over 100 watts). The driver urgently needs to be improved here, especially since the PCIe does not clock down either, not even on a current Intel system. By the way, we can see very nicely that almost the full TBP is utilized starting from WQHD (in contrast to the RTX 4080) and even the torture loop barely increases. AMD’s new implementation of telemetry for the entire card has a very limiting effect here. I had already discussed this in several articles and AMD also communicated it this way. The matching link to the article is available again at the bottom of this page.
The Radeon RX 7900XT has virtually the same problem at idle. The maximum possible TBP is not quite reached in gaming, but slightly exceeded in the stress test. The rest is analogous to the big sister.
Load distribution between PCIe slot and the PCIe sockets
The power supply layout of the Radeon RX 7900XTX shows that the card was sewn close to the edge in terms of TBP and rail performance. While the two 8-pin ports are fully utilized, the motherboard slot is still quite good with 4.3 amps. But at the latest when overclocking, the 300 watts at the two sockets would be exceeded and you would also reach the allowed 5.5 amps at the board faster than desired. I hardly see any air here, so I have also dispensed with the OC.
The Radeon RX 7900XT shows the same load distribution, but the TBP is also lower and there is more room for improvement.
All in all, AMD has almost fully utilized the load distribution here, which is actually a bit irritating. While NVIDIA has almost completely stopped supplying via the PEG, AMD uses this rail quite excessively. Did they simply want to save the third 8-pin, which the board partners have implemented, for PR reasons? In this context, the new partial voltage VDDCR_USR also raises some questions. However, no tangible information on this can be found in the board partners’ documents either. The up to 20 watts that AMD only provides there via the RX 7900XTX’s two phases is slightly surprising, since a single voltage regulator would probably have been more than sufficient for that.
- 1 - Introduction, technical data and technology
- 2 - Test system with the igor'sLAB PC from MIFCOM
- 3 - Teardown: PCB and Components
- 4 - Teardown: Cooler and disassembly help
- 5 - Summary gaming performance WQHD (2560 x 1440)
- 6 - Summary gaming performance Ultra-HD (3840 x 2160)
- 7 - Single charts for WQHD (2560 x 1440)
- 8 - Single charts for Ultra-HD (3840 x 2160)
- 9 - Workstation graphics and rendering
- 10 - Power consumption in detail and load balancing
- 11 - Transients, limits and PSU recommendation
- 12 - Clock rates, temperatures and infrared
- 13 - Fan speed and Noise
- 14 - Summary and conclusion
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