Ryzen 7 5800X3D can work very efficiently even under 1 V

Shaun used a fairly standard ASUS PRIME X570-Pro, and we know that AMD has set a power limit of 1.35 V for this CPU to protect the V-Cache from damage, but it is possible to reduce the processor’s supply voltage by completely normally.

This is a widely used trick to ensure low CPU consumption, you just need to find a voltage level at which the processor is still stable. However, it is obvious that at reduced voltage it may not offer us the same turbo frequencies as at the default setting, so we can expect that along with consumption and heat output, power can also go down. But even that is part of the experiment, ie finding the optimal balance between consumption and performance for us.

Shaun started at 1.19 V and gradually it got to just 1 Vwhen the very significant decrease in consumption was already fully manifested, while according to the author the processor was still able to work with all cores up to 4.4 GHz, while the load temperatures with Cinebench fell below 45 ° C and the software reported consumption of only 73 W. note that a water cooler with a 420mm radiator was also used for cooling, however, originally the Ryzen 7 5800X3D still ran at a load of 80 ° C.

This turned out to be the optimal setting in the end, if Shaun didn’t want to lose power, but at what voltage can the Ryzen 7 5800X3D still work at all? The lowest voltage for stable operation was 0.844 V and it stated a consumption of only 57 W and a temperature of only around 40 ° C. Moreover, surprisingly, the clock frequency did not decrease in the total load, but even so, the processor actually lost power, at least according to the test results. At 1V, however, the power should be more or less the same.


Source: Svět hardware by www.svethardware.cz.

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