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reddit.com › r › techsupport › comments › 1eje0cg › ryzen_7_5800x_undervolt

This tells me nothing. If you don't know what you're doing, you could easily flip the wrong toggle and end up causing damage instead. Please do more research before attempting. There are plenty of guides on YouTube. I would also do this in the BIOS and not mess around with Ryzen Master at all. Ryzen Master is known to be buggy and persistent, in the worst ways possible. It's hard to recover if something goes wrong. The general idea is to lower the voltage curve. Your CPU uses more voltage under load and less on idle. There is a "curve" that determines how much voltage is fed to the CPU according how much work the CPU is doing. You can either lower this curve for all cores at once or fine tune it per core. With this method of undervolting you can't just say "voltage 1.1v" since the voltage figure can fluctuate depending on what the CPU is doing at a given time. Instead, in PBO2 you can set the voltage offset number from -30 to 30. Negative values mean less voltage/lower voltage curve and positive values mean higher/more voltage curve. To undervolt, you'd set these numbers to be negative. I personally set it to -10 for all cores to start with. Too low voltage means you run into stability issues. It's harder to detect this instability with a high load stress test like Prime95 because when the CPU is under load, more voltage is fed into it. This means it is possible the CPU might not crash under heavy load, but crashes under low loads/idle states. It's a pain in the ass to get right. Save yourself the headache and don't get too much into it. As long as you lower the voltage offset value for all cores just before you get stability issues when idle then you're good. See this thread for how to use CoreCycler to test whether you're stable at idle. https://www.reddit.com/r/overclocking/comments/11bbgc1/how_do_i_test_undervolt_stability_in_idling_not/ Or you could just set it to more conservative values like -5 or -10 and forget it. The CPU boosts a bit more here and there because of the lower temps but the main thing here is it must be worth the stability and time trade off. Don't get too disappointed if -5 causes a crash. It could be that one of your cores can't do an undervolt at all. The next step would be to determine the problematic core. You can use Windows Event Viewer to see which core fails but the number assigned to each core is tricky and may not represent the correct core. With 8 cores on the 5800X you could go for trial and error. Once you know which core needs more juice than others, you can then fine tune the voltage curve core by core. But... Is it worth the tinkering time for 3-5% more performance? Is it worth the potential stability issues? Are your temps so high your CPU is throttling? Can't you simply get a bigger cooler? Remember, even if your CPU benchmarks higher by 3-5% in synthetic benchmarks, this doesn't mean it's a 1:1 translation of performance to real-world applications. Your FPS in games probably won't increase by 5%, for example. By all means try it out (be careful!) but don't expect miracles. These CPUs are already tuned to the extreme from the factory. Answer from NeVMiku on reddit.com

reddit.com › r/techsupport › ryzen 7 5800x undervolt

r/techsupport on Reddit: Ryzen 7 5800X Undervolt

August 3, 2024 -

Are these settings alright? I am using AMD Ryzen Master, not the BIOS though.

CPU Clockspeed 3.8MHz

CPU voltage 1.1V

Top answer

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This tells me nothing. If you don't know what you're doing, you could easily flip the wrong toggle and end up causing damage instead. Please do more research before attempting. There are plenty of guides on YouTube. I would also do this in the BIOS and not mess around with Ryzen Master at all. Ryzen Master is known to be buggy and persistent, in the worst ways possible. It's hard to recover if something goes wrong. The general idea is to lower the voltage curve. Your CPU uses more voltage under load and less on idle. There is a "curve" that determines how much voltage is fed to the CPU according how much work the CPU is doing. You can either lower this curve for all cores at once or fine tune it per core. With this method of undervolting you can't just say "voltage 1.1v" since the voltage figure can fluctuate depending on what the CPU is doing at a given time. Instead, in PBO2 you can set the voltage offset number from -30 to 30. Negative values mean less voltage/lower voltage curve and positive values mean higher/more voltage curve. To undervolt, you'd set these numbers to be negative. I personally set it to -10 for all cores to start with. Too low voltage means you run into stability issues. It's harder to detect this instability with a high load stress test like Prime95 because when the CPU is under load, more voltage is fed into it. This means it is possible the CPU might not crash under heavy load, but crashes under low loads/idle states. It's a pain in the ass to get right. Save yourself the headache and don't get too much into it. As long as you lower the voltage offset value for all cores just before you get stability issues when idle then you're good. See this thread for how to use CoreCycler to test whether you're stable at idle. https://www.reddit.com/r/overclocking/comments/11bbgc1/how_do_i_test_undervolt_stability_in_idling_not/ Or you could just set it to more conservative values like -5 or -10 and forget it. The CPU boosts a bit more here and there because of the lower temps but the main thing here is it must be worth the stability and time trade off. Don't get too disappointed if -5 causes a crash. It could be that one of your cores can't do an undervolt at all. The next step would be to determine the problematic core. You can use Windows Event Viewer to see which core fails but the number assigned to each core is tricky and may not represent the correct core. With 8 cores on the 5800X you could go for trial and error. Once you know which core needs more juice than others, you can then fine tune the voltage curve core by core. But... Is it worth the tinkering time for 3-5% more performance? Is it worth the potential stability issues? Are your temps so high your CPU is throttling? Can't you simply get a bigger cooler? Remember, even if your CPU benchmarks higher by 3-5% in synthetic benchmarks, this doesn't mean it's a 1:1 translation of performance to real-world applications. Your FPS in games probably won't increase by 5%, for example. By all means try it out (be careful!) but don't expect miracles. These CPUs are already tuned to the extreme from the factory.

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different computer setups can handle undervolting at different levels. you need to slowly keep going lower till you lose stability. use stress testing software like prime95 for 30min to test

reddit.com › r/overclocking › undervolting ryzen 7 5800x

r/overclocking on Reddit: Undervolting Ryzen 7 5800x

November 6, 2023 - In general i recommend to go with +150 boost, 1x scalar, optimized pbo limits and then start with -30 on all cores and use newest version of corecycler(alphaversion) that supports automatically raising undervolt value +1 on error.

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Ryzen 5000 Undervolting with PBO2 – Absolutely Worth Doing