Undervolting Ryzen 7800x3d

[KrzysiuM]

Does undervolting Ryzena 7800x3D make sense? Won't that reduce efficiency? With what settings in the MSI BIOS do this?

[Illusion of Progress]

If you want to see if there's gains to be had in the departments of lower temperatures and/or maybe sustaining higher multi-core boost, then yes, it might make sense.

If you're not fussed with testing stability for the small gains those could bring, then it might not be worth it. Sustaining some double digits or low hundreds of digits higher in some multi-core loads probably won't be observable to you and will fall just outside margin of error gains in benchmarks maybe. And lower temperatures are nice but again the impact is it may hold higher multi-core boost which will do minimal for real world game results (the single core boost will not go higher).

So it's up to you. If you have the time and willingness to test, there's nothing to lose to try.

I don't know about the 7800X3D but the 5800X3D usually undervolted to -30 rather reliably.

[De Hollandse Ezel]

I would sooner undervolt to save on the electricity bill.

if undervolting severly lowers the watt use of a conponent without affecting performance too much, it is worth it.

the 7800x3D is with it's just 120W already quite power efficent.
but granted top cpus used to use 80-100w

while an 7800x3D already has way more performance than you need
-if you can cut 40w off by sacrificing 10% of its performance that be worth it.

with amd not giving you acces to the multyplyer thats hard to achieve though. some did manage to get it to run 85W.. stable bit it also sacrificed quite a lot of performance..

[Agent]

It depends on the goal. If you want the best way to improve thermals and noise levels disable turbo boost entirely.

To do this you'll need to enable processor boost mode. You can do so in the registry by following this Github post: https://gist.github.com/ehsan18t/268fa28f581e512a0a0df66b95daab88

Next you go into your "Choose a power plan" on the start menu. Set balanced > change plan settings > change advanced power settings > processor power management > processor performance boost mode.

Set to disabled. You likely won't notice the performance drop as the base clock on the 7800x3D is still high at 4.2GHz. This can be worse for Intel chips that drop down to a 2.9GHz base clock. But for most AMD chips disabling turbo boost has minimal effects on performance, but huge gains in thermals / noise levels.

Hope this helped in some way.

[C1REX]

Originally posted by De Hollandse Ezel:

with amd not giving you acces to the multyplyer thats hard to achieve though. some did manage to get it to run 85W.. stable bit it also sacrificed quite a lot of performance..

The 7800x3D runs at 30-60W while gaming. There isn't much to cut and risking stability issues.

https://tpucdn.com/review/intel-core-i9-14900k/images/power-games-compare-vs-7800x3d.png

[Bad 💀 Motha]

It's a good idea to under-volt any CPU and/or GPU if it allows you to do so, however you will have to run some tests after such changes so you can be sure that it's still stable at lower voltage. There also is not just one voltage for the CPU, it has many, such as the Off-Set Voltages which are also very important.

Doing this successfully will allow you to draw less power overall as well as reduce the CPU heat output.

The overall CPU performance won't change. If so then this is tied in with overall system stability; and thus is not stable.

[AmaiAmai]

Originally posted by De Hollandse Ezel:

I would sooner undervolt to save on the electricity bill.

if undervolting severly lowers the watt use of a conponent without affecting performance too much, it is worth it.

the 7800x3D is with it's just 120W already quite power efficent.
but granted top cpus used to use 80-100w

while an 7800x3D already has way more performance than you need
-if you can cut 40w off by sacrificing 10% of its performance that be worth it.

with amd not giving you acces to the multyplyer thats hard to achieve though. some did manage to get it to run 85W.. stable bit it also sacrificed quite a lot of performance..

AMD CPUs only pull that much in certain scenarios with boost mode and power target set that high. I can tell you that my 7000-series only pulls at most 50w where I set it (boost off), but typically only around 10-30w in a gaming load that is not CPU heavy.

Floating point or compute is the only task that makes power usage rise anywhere near 90W or greater if the heat rises. At that point, I would consider looking for areas to save power esp. if you have more than one system, but not for gaming.

If a game is using CPU compute to that extent in this day and age, it's trash and likely has poor optimization elsewhere OR it better be a simulation/AI heavy game.

[MancSoulja]

Just use AMD's curve optimiser, my 7800x3D is stable with a -40 all core offset and runs at 65-70c even playing demanding games.

[Bad 💀 Motha]

Originally posted by MancSoulja:

Just use AMD's curve optimiser, my 7800x3D is stable with a -40 all core offset and runs at 65-70c even playing demanding games.

That's good, very helpful since the Ryzen 7000 series dish out way too much heat by default. No modern AMD/INTEL cpu should be left on defaults. All you are doing by being lazy or uninformed about that is it will heat your room and drive up power costs. Might even have greater negative impact on hardware lifespan by just leaving the BIOS CPU settings all on the defaults.


This is also helpful because modern CPUs also give you plenty of power to where even the most demanding game doesn't need to push the entire CPU to the fullest. They have breathing room for plenty of multitasking while running the most demanding of game at the same time

[Agent]

Originally posted by Bad 💀 Motha:

Originally posted by MancSoulja:

Just use AMD's curve optimiser, my 7800x3D is stable with a -40 all core offset and runs at 65-70c even playing demanding games.

That's good, very helpful since the Ryzen 7000 series dish out way too much heat by default. No modern AMD/INTEL cpu should be left on defaults. All you are doing by being lazy or uninformed about that is it will heat your room and drive up power costs. Might even have greater negative impact on hardware lifespan by just leaving the BIOS CPU settings all on the defaults.


This is also helpful because modern CPUs also give you plenty of power to where even the most demanding game doesn't need to push the entire CPU to the fullest. They have breathing room for plenty of multitasking while running the most demanding of game at the same time

CPU's have always been tuned for benchmark performance, not what's most optimal for noise / thermals.