The various reviews of AMD’s new Radeon RX 6800 video cards have shown that the efficiency of RDNA 2 is fine. In terms of performance per watt, the red cards are slightly better than Nvidia’s Ampere. In addition to some overclocking tests, at ComputerBase they also looked at how economically they could make the new cards using an undervolt.
The results are very promising. Although the RX 6800 XT was reduced from its standard 1.15 volts to 1.025 volts, the average clock speed in games increased. This resulted in a performance gain of about three percent – while the card consumed about 10 watts less.
Only really interesting are the results of the non-XT card, the RX 6800. Although the performance of the card will not perform significantly better after the undervolt, the power consumption does decrease considerably: from about 230 Watt to about 183 W This also had favorable consequences for the temperatures and noise production of the card.
The voltage limit used was 0.9 volts, versus 1.025 volts at the default setting.
Undervolt results on the RX 6800 and 6800 XT. Image: ComputerBase.
With that power consumption, the RX 6800 comes after this undervolt in the field of laptop GPUs. Nvidia’s RTX 2080 Super for laptops, for example, is between 150 and 200 W in tdp, depending on which variant is used. AMD could thus far exceed that with about the same power consumption in terms of performance, provided it selects its chips for economy.
Nvidia is expected to release a ditch of new Ampere models early next year, including mobile variants. AMD’s plans for laptop versions of RDNA 2 are not yet clear.
Sources: ComputerBase, @rogame (Twitter)
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