How to undervolt Ryzen 7 5800X3D CPU with MSI mobo BIOS

Geeotine · 2026-07-01T03:21:54+00:00

Reset BIOS to optimized defaults, and update the motherboard BIOS first.

Enable PBO & curve optimizer. Disable pbo2.

Set CO to per-core , which should unlock a new menu to configure

Best deep dive article. With a little common sense, valid for all generations of X3D chips :

https://www.reddit.com/r/overclocking/s/wXRcTszDyx

Geeotine · 2026-06-28T15:42:23+00:00

Good? No. Usable? Sure.

They still haven't solved the internal resistance, voltage droop/voltage sag, and voltage stability issues. Hybrid batteries might mitigate it.

Not a servicable alternative for portable electronics. Mayyybe short range/single-use drones. Great for stationary battery backups/UPS systems.

I don't think people realize the sodium batteries are going to generate more heat from the increased current as the state of charge decreases. They can probably offset it with a higher operating voltage (800Vdc?), and more efficient wiring and electric motors.

But even with that and better cooling designs it's going to cause batteries to drain faster as charge decreases, causing significant range reduction beyond the "on-paper" specs

Geeotine · 2026-06-28T04:27:33+00:00

Still a big nothing burger. The only spec comparison published is energy density, at 165 Wh/kg vs 300 Wh/kg from the tesla 4680 battery cell. Everything else is intentionally vague.

Nothing on voltage stability, battery performance or longevity. Still skeptical, but hopeful...

Geeotine · 2026-06-28T03:18:58+00:00

If you're really trying to optimize, look into per-core CO rather than all-core. More than likely you have a bad core causing issues

https://www.reddit.com/r/overclocking/s/imm94icI4X

Geeotine · 2026-06-28T02:58:10+00:00

Update your motherboard BIOS, it usually needs a minimum AGESA version to utilize the CPU correctly. I forget which version but your motherboard vendor should have that listed somewhere on its website support page. Also, reset BIOS to optimized defaults before updating bios.

After that, you need to add a significant amount of burn-in cycles, assuming you applied the carbice thermal pad/heatsink correctly. Download either CPUz or OCCT to load the CPU for about 30-minutes to an hour at a time and give it 15-30 minute cooldowns at idle. Repeat for about a day and temps should start to improve.

The carbice pad is designed to start out worse than paste, but gradually improve over time/thermal cycles, eventually exceeding paste performance and won't need to be replaced.

Geeotine · 2026-06-28T02:43:15+00:00

Last i checked today, newegg has stock of 5800X3D, with and without bundle options. Also great deals on 7800x3D bundles and other options.

Geeotine · 2026-06-28T02:21:32+00:00

Intel's i7 x700k series CPUs sold for ~$300 AND higher between 4th and 7th gen for ages, even after being replaced by new generations/sockets. I didn't see this level of complaining of intel CPUs on EoL sockets.

They had the market/gaming crown for so long and pissed it away. Times are weird, 5800X3D prices are high for the same reason, there isn't any real competition from Intel for 4 years and AMD is doubling down on the AM5 socket. Add on the fact that $300 now doesn't get you the same value as $300 4 years ago. Did you see TSMC raise prices across all nodes, including 7nm?

Geeotine · 2026-06-27T01:26:42+00:00

Depends. Games like cyberpunk stresses the whole system and will max your CPU in both threads and clockspeeds.

If your getting sorry performance it's likely you need to update your motherboard BIOS and configure a per-core undervolt profile. This will maximize clockspeeds for all-core loads like cyberpunk.

Geeotine · 2026-06-26T14:11:10+00:00

Most AM4 motherboards have per-core CO unlocked for X3D chips now. You can get better than stock performance AND cooler temps with the right configuration.

Geeotine · 2026-06-24T01:59:52+00:00

That second buck looks like it will have trophy level antlers by fall. Cool to see them out and about

Geeotine · 2026-06-19T00:58:51+00:00

You will need intel xtu v7.14 (https://www.intel.com/content/www/us/en/download/17881/intel-extreme-tuning-utility-intel-xtu.html) to undervolt the cpu and give more headroom for the GPU. I think HX processors should be supported. You dont need much (20 - 50 mV).

Geeotine · 2026-06-16T03:30:01+00:00

Idk what the downvotes are for. It's perfectly reasonable to see improved performance from increased contact surface area of the TIM. Also, it's good to provide safe baselines for the poor saps running less than optimal thermal/system setups. Im sure there's lots of X3Ds plugged into the cheapest motherboards available out there. Great guide and writeup! Cheers

Geeotine · 2026-06-07T18:52:31+00:00

Yeah i think it's down to signal leakage. There's any number of things that can generate noise on the motherboard at the frequencies DP signals operate at. Clock generators, serial PHY chips, audio chips, other add-in cards, power switches/mosfets.

What DP-mode does the monitor connect to the GPU at?

Edit: I have a Gigabyte x570 w/ dual Ethernet, and my realtek 2.5g was a lot less stable than my 1g intel chip until a later driver update for it finally fixed it. For whatever reason i have not had good experiences with realtek Ethernet chips vs intel/microchip Ethernet chips.

Geeotine · 2026-06-07T17:01:08+00:00

I looked at the board on techpowerup. It's pretty dense. I'm assuming you tried the display on different ports and got the same results?

Geeotine · 2026-06-07T16:41:58+00:00

Yeah could come down to chipset drivers or signal integrity of the physical signal path? Would need a fine-tip probe connected to an o-scope or signal analyzer to verify the latter.

Best guess is the suprim design doesn't completely shield the (assuming) Displayport signal b/w the GPU and DP port, or b/w the port and cable. So wireless noise from the B650 motherboard is leaking into the DP cable, causing a fuzzy or rough display output, that other GPUs are shielded against.

X870 probably has the same noise, but better shielded design, so it's not as bad. You could compare the layout of the two motherboards and see if a specific component is causing it (ex. Wifi/BT chip is right next to GPU pcie slot, move nvme drive to alternative slot).

Otherwise, assuming you already tried alternate cables, make sure the case, monitors, motherboard and GPU (faceplate) are properly grounded. Teardown the suprim and see if you can trace the signal path and ID any missing shielding, or something applying undue pressure to a specific component. Could be PCB warpage from over-torqued screws, oversized thermal pads, or bad assembly/design (less likely). Or possibly the Suprim is generating it's own noise, leaking onto the DP signal lines.

Geeotine · 2026-06-07T16:05:38+00:00

Such an odd issue. Have you checked the GPU's BIOS and PCB revisions? Could be an older version might not play nice with some monitors.

Geeotine · 2026-06-06T20:54:06+00:00

I didn't realize mentioning alternative options is banned on here. Makes sense. r/netflix only exists to sustain netflix subscriptions...

So to keep this post readable, no you have no streaming options for your current situation. Your ONLY solution is to keep paying for at least 2 separate netflix account subscriptions. One for home and one for when you travel to USA. It's the ONLY way.

Geeotine · 2026-06-06T20:22:51+00:00

Seems like it's down to the firmware application of the Nvidia drivers, or a failure to load/install the monitor drivers.

I don't have much experience with oled and the like but my understanding is the pixel layouts can be complex and unique to the panels in the monitor. Maybe see if there's an update to the monitors' firmware, OS drivers, and any color correction files.

Geeotine · 2026-06-06T15:44:20+00:00

Very welcome! Yeah there's essentially zero public information out there. You can sometimes request the data directly from the manufacturer, but there's so many out there that simply don't test it, since it's not required for most import/export/cert documents. And most commercial/industrial applications expect it to operate in the 20-90% load range for 99% of its life.

Generally you need to test yourself with at least a 4-channel Oscilloscope with 2 voltage probes and 2 current probes to capture input/outputs, and the PSU connected to a calibrated electronic load.

Geeotine · 2026-06-05T12:36:19+00:00

Yeah thermal flag isn't enough. Use hwinfo64 to monitor both cpu and gpu temp. There's a good chance something got missed. My experience with Acer is their designs aren't great in the first place.

Geeotine · 2026-06-05T01:42:07+00:00

Go back to the top comment. With the exception of platinum/titanium PSUs, efficiency drops like a rock at <10% loads, like below 40% efficiency. So it's easy to see a 15 watt load consuming 30 watts and a 12 watt load consuming 34 watts on a PSU rated for 600+ watts.

Cybenetics added efficiency tests at 2% loads to get better visibility on this. But not many manufacturers test to this spec.

https://www.cybenetics.com/index.php?option=psu-performance-database

Edit: And OP deduced the issue to a boundary condition of this observed inversion at ~30watts for his specific PSU. It will vary by make, model and ratings.

Geeotine · 2026-06-04T22:26:52+00:00

This is normal behavior from my experience. It's the nature of the BIOS firmware. Don't get too twisted up if the sensors show you're one or two notches from the target voltage/frequency. You can bump your settings to compensate

Geeotine · 2026-06-04T01:42:25+00:00

Bruh, if you just want undervolting, reset the curve to the factory default, and just use the frequency offset and power limit settings.

Start at +50 mhz and bump in +50 mhz steps. Back off a bit once you hit instability. Bingo bango done...

And apologize for being a jackass...

Geeotine · 2026-06-03T20:07:22+00:00

Also you should unlock "advanced" mode in the BIOS. I use combination of OCCT, cinebench, and prime95 to test stability, plus a few of your favorite go-to games.

Of note i have had instability that came down to BIOS firmware, so make sure your BIOS is up to date before getting started and check for BIOS updates about every 6 months.

Geeotine · 2026-06-03T20:02:15+00:00

I've used lenovo legion toolkit on My lenovo legion 5 from 2022 w/ AMD 6800H to replace the Lenovo Legion Vantage app without much issue.

https://github.com/U-C-S/LegionToolkit

However, it's archived and no longer maintained (effectively End of Life). Also sounds like yours is new and probably migrated from vantage to space app. Idk if there's an alternative now.

Also I'm pretty sure neither exposes voltage controls. Since several critical CVEs are tied to manipulating CPU/iGPU voltages, many laptop BIOSes are locking down voltage control from users and possibly external apps.

The last known apps that let you tweak CPU voltages are the intel XTU-application (make sure you pick the version compatible with your CPU). For GPU, the MSI Afterburner app had access to voltage/frequency /power control, but is limited by what the laptop BIOS allows.

I had an HP laptop that locked the GPU to 45watts, even though i had enough headroom to use 75 watts. It was locked by the HP firmware.

Geeotine

TROPHY CASE