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Low voltage options for Ryzen 7000 processors

Low voltage options for Ryzen 7000 processors

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GabbyX
Junior Member
49
03-01-2022, 02:49 AM
#1
Hey there! Based on the recent issues with the Ryzen 7000X3D, I'm looking for advice from experienced users. Could you share the recommended safe voltage ranges for Ryzen 7000 CPUs? I'm especially interested in how different voltages affect performance when using Expo profiles. My build has a fresh 7700X with Expo enabled, and it worked well without overvoltage. However, I'm curious about the relationship between VDDIO/MC and SOC voltage. My experience shows a noticeable gap between them, and I'm concerned about memory stability with high-speed drives and lower VDDIO/MC settings. If raising the SoC slightly allows me to adjust VDDIO/MC, I'd appreciate your guidance. Thanks in advance!
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GabbyX
03-01-2022, 02:49 AM #1

Hey there! Based on the recent issues with the Ryzen 7000X3D, I'm looking for advice from experienced users. Could you share the recommended safe voltage ranges for Ryzen 7000 CPUs? I'm especially interested in how different voltages affect performance when using Expo profiles. My build has a fresh 7700X with Expo enabled, and it worked well without overvoltage. However, I'm curious about the relationship between VDDIO/MC and SOC voltage. My experience shows a noticeable gap between them, and I'm concerned about memory stability with high-speed drives and lower VDDIO/MC settings. If raising the SoC slightly allows me to adjust VDDIO/MC, I'd appreciate your guidance. Thanks in advance!

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SOBERALHAZIEL
Member
133
03-01-2022, 06:48 AM
#2
VDDIO_MEM is the voltage that is used to transfer data from between the memory controller and the DIMMs. By spec, it is supposed to be set to the same value as the DRAM_VDD/VDDQ voltages, so it should in theory be safe up to 1.4V (the highest EXPO rated memory kits), though in my experience it hasn't had any impact on stability from 1.2 to 1.45V (the lower bound might depend on your CPU, memory kit, and board though). Personally I wouldn't bother touching it, it's unlikely to cause issues in the future with the current data we have available. It has no relation to the SOC voltage, though it does admittedly go to the IO die like SOC voltage does. Check to make sure it actually is running at 1.18V, Gigabyte boards have a bug where it can just ignore the SOC voltage set at some points, and you need to set it with EXPO enabled and in two different locations for it to apply. Assuming it is running at 1.18V, you could probably go a bit lower if you're that concerned. At least on the 7800X3D I've messed around with, it could do 6200 all the way down at 1.15V (it might even do a little lower, though it crashes at 1.1), so I'd assume that at a slightly lower clock speed it could go even lower assuming it's a decent chip (that 7800X3D has an admittedly very good IMC). There is VDD_MISC and a couple other internal voltages like VDDP, VDDG IO and CCD, though these are so low power that they shouldn't cause a CPU to blow up, plus I'm not aware of a board that sets them above ~1.15V (in my experience, this is the optimal value anyway). They're only really important to set manually if you're doing FCLK overclocking and the board sets them wrong for your chips.
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SOBERALHAZIEL
03-01-2022, 06:48 AM #2

VDDIO_MEM is the voltage that is used to transfer data from between the memory controller and the DIMMs. By spec, it is supposed to be set to the same value as the DRAM_VDD/VDDQ voltages, so it should in theory be safe up to 1.4V (the highest EXPO rated memory kits), though in my experience it hasn't had any impact on stability from 1.2 to 1.45V (the lower bound might depend on your CPU, memory kit, and board though). Personally I wouldn't bother touching it, it's unlikely to cause issues in the future with the current data we have available. It has no relation to the SOC voltage, though it does admittedly go to the IO die like SOC voltage does. Check to make sure it actually is running at 1.18V, Gigabyte boards have a bug where it can just ignore the SOC voltage set at some points, and you need to set it with EXPO enabled and in two different locations for it to apply. Assuming it is running at 1.18V, you could probably go a bit lower if you're that concerned. At least on the 7800X3D I've messed around with, it could do 6200 all the way down at 1.15V (it might even do a little lower, though it crashes at 1.1), so I'd assume that at a slightly lower clock speed it could go even lower assuming it's a decent chip (that 7800X3D has an admittedly very good IMC). There is VDD_MISC and a couple other internal voltages like VDDP, VDDG IO and CCD, though these are so low power that they shouldn't cause a CPU to blow up, plus I'm not aware of a board that sets them above ~1.15V (in my experience, this is the optimal value anyway). They're only really important to set manually if you're doing FCLK overclocking and the board sets them wrong for your chips.

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samarimonkey
Junior Member
17
03-01-2022, 02:39 PM
#3
I appreciate your kind words and the detailed explanation. I just need to note that my system uses a Crosshair X670E Hero motherboard. The SOC voltage seems to be correctly displayed at 1.18V, matching BIOS stats and Windows HWinfo. I’m hoping this is the intended setting, as Steve from GN mentioned Asus might be underreporting values by around 50mV. Based on your guidance, I’ll keep the SOC at 1.18V. Also, I’ll align the VDDIO/MC voltage with the memory sticks, which are set to 1.35V. The other misc voltages appear auto-set at various levels as shown in HWinfo. Thank you for your helpful advice and clear post!
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samarimonkey
03-01-2022, 02:39 PM #3

I appreciate your kind words and the detailed explanation. I just need to note that my system uses a Crosshair X670E Hero motherboard. The SOC voltage seems to be correctly displayed at 1.18V, matching BIOS stats and Windows HWinfo. I’m hoping this is the intended setting, as Steve from GN mentioned Asus might be underreporting values by around 50mV. Based on your guidance, I’ll keep the SOC at 1.18V. Also, I’ll align the VDDIO/MC voltage with the memory sticks, which are set to 1.35V. The other misc voltages appear auto-set at various levels as shown in HWinfo. Thank you for your helpful advice and clear post!

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Baallog
Member
189
03-05-2022, 04:29 AM
#4
I'm adjusting my RAM settings right now for the 7700X with an Asus B650E-E motherboard. From what I've learned, a 1.3V SOC should still be fine even at the higher limit. When I reduced it from 1.35V to 1.3V, my overclocking stopped working. Raising the VDD voltage for DDR seems to have fixed the problem completely. That’s another way to improve stability. Meanwhile, if you're using a Hynix board, setting your timings manually with this guide can give you an easy performance boost.
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Baallog
03-05-2022, 04:29 AM #4

I'm adjusting my RAM settings right now for the 7700X with an Asus B650E-E motherboard. From what I've learned, a 1.3V SOC should still be fine even at the higher limit. When I reduced it from 1.35V to 1.3V, my overclocking stopped working. Raising the VDD voltage for DDR seems to have fixed the problem completely. That’s another way to improve stability. Meanwhile, if you're using a Hynix board, setting your timings manually with this guide can give you an easy performance boost.

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_P1tty_
Junior Member
4
03-06-2022, 08:08 PM
#5
Hey, thanks for sharing. Your 7700X is working smoothly with the 2x16, 6000, CL30 at 1.18V, though you might be able to lower it a bit without affecting performance. I noticed stability issues when adjusting VDDIO/MC below 1.30V, but following RONOTHAN's advice to match the memory kit's voltage (around 1.35V) helped stabilize things. I'm considering using Buildzoid's optimized settings, but right now I'm running a standard 3080 at full settings and 144Hz/1440p. With heavy usage, I'm hitting CPU and RAM limits. If you're thinking of upgrading to a high-end RTX 40, you might need to tweak those timings.
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_P1tty_
03-06-2022, 08:08 PM #5

Hey, thanks for sharing. Your 7700X is working smoothly with the 2x16, 6000, CL30 at 1.18V, though you might be able to lower it a bit without affecting performance. I noticed stability issues when adjusting VDDIO/MC below 1.30V, but following RONOTHAN's advice to match the memory kit's voltage (around 1.35V) helped stabilize things. I'm considering using Buildzoid's optimized settings, but right now I'm running a standard 3080 at full settings and 144Hz/1440p. With heavy usage, I'm hitting CPU and RAM limits. If you're thinking of upgrading to a high-end RTX 40, you might need to tweak those timings.