Little. Benchmark it.

it's not worth losing clock speed and perfomance, just use the curve optimiser and set it to -20 negative, at least mine is stable there, besides i got mine running on 5.6ghz

your doing this wrong.....unlike the 7800X3D the 9800X3D has the 3d cache in a sideways stack on the bottom of the CPU.....you have miles of thermal head room VS the 7800X3D that used a vertical stack on the die side of the PCB.....5.4ghz is the normal for the 9800 to run.....1.28volts is all that is needed in most cases......these CPU's always being at 70C wont hurt anything

as for performance its really going to come back to resolution used.....1080p will see loses 1440p not so much.....plus added in to this will be the game engine.....something like counter strike could see swings of a 100 frames depending on factors BUT wont really matter much when its something nuts like 400 frames VS 500.....

Ok i ll try tu push it on 5,4

when undervolting, dont mess with clocks as that reduces its power needed too

one at a time til unstable and go back to stable

Leave the clocks alone. If anything disable the Turbo crap and set the Base to the spec'd Turbo if possible and stable. However unlike old CPUs Vcore is not the only thing you need to worry about there are other voltages and offsets to change too.

With modern Motherboard and using WinOS you're probably better off making the changes with AMD Ryzen Master instead of the BIOS. Depending on what all you wish yo change.

Downclocking the CPU is rather dumb though. If anything, these CPUs can boost even higher while still staying under 75-85*C quite easily with proper cooling. But yes the voltages are good place to start since that contributes most to the CPU and VRM heat.

Make sure to lock in the RAM with AMP/XMP or whatever they call it now..

Make sure to update to latest bios from Motherboard maker and get latest amd chipset driver from amd website

Originally posted by 󠀡󠀡󠀡󠀡⁧⁧Vivi:

it's not worth losing clock speed and perfomance, just use the curve optimiser and set it to -20 negative, at least mine is stable there, besides i got mine running on 5.6ghz

do you have the same processor?

Originally posted by Storyteller:

Originally posted by 󠀡󠀡󠀡󠀡⁧⁧Vivi:

it's not worth losing clock speed and perfomance, just use the curve optimiser and set it to -20 negative, at least mine is stable there, besides i got mine running on 5.6ghz

do you have the same processor?

yes

In passing I noticed a video about this on youtube.

just to chime in with my experience regarding the 9800x3d.

in a normal size case, leaving everything stock works perfectly fine with a phantom spirit 120 dual tower cooler.

i haven't seen much improvement with temperatures going to a -20 curve optimizer setting, but since it's stable it will save a little power, so i just left it on.

you can go +200mhz on the PBO options and it stays stable with the -20 undervolt. just depends if you want to push the processor like that or not. i personally just stuck with a normal undervolt and no clock speed increase

Originally posted by nintendork07:

just to chime in with my experience regarding the 9800x3d.

in a normal size case, leaving everything stock works perfectly fine with a phantom spirit 120 dual tower cooler.

i haven't seen much improvement with temperatures going to a -20 curve optimizer setting, but since it's stable it will save a little power, so i just left it on.

you can go +200mhz on the PBO options and it stays stable with the -20 undervolt. just depends if you want to push the processor like that or not. i personally just stuck with a normal undervolt and no clock speed increase

What are your temps?

I cant understand why your cpu temps are high. Our amd normally 35 45 degree but under stres ocasionally 63 degree but not always.
Try disabling otomatic overclock nonsense your cpu and open cpu temp control. It will direct

I’ve had my 9800X3D for about 4 months. I wasn’t satisfied enough with the temps I got from CO -20, so I went with -100mhz in PBO and the temps decreased from around 73c to 65c in cinebench R23) and voltage decreased from around 1,08 to 1,04. I never noticed any difference in games, I still get 500+ fps in CS2 and in AAA games I’m still GPU limited with an RTX 5080. I would definitely recommend lower clocks to those who want to improve efficiency.

Originally posted by KrzysiuM:

I untervolted i to 1.03V and lowered the clock to 5Ghz from 5,2. Results are pretty nice temperature deacresed to below 50 celsius in most games, but will there be a significant loss of performance with that setting?

No. Most games aren't CPU limited, and even then, those that are aren't limited by core clock for the most part. They are limited by compute which sees little to no benefit when overclocking on consumer chips . And since you probably have everything else set to "AUTO" it means that your system's optimal state will be determined more by what you haven't touched than by what you did.

AMD has a fine-tuned scheduler on those CPUs that handles load balancing and instructions. That part of the firmware won't change just because you change clocks.

If the firmware says that an operation takes 4 cycles to complete and must be synchronised with another operation being done, then no matter how fast your core clock is, you not gonna move faster until that sync happens. If you do and it's unsynced, the CPU will throw flags and HALT. For you that means a computer freeze or restart.

The CPU will just throw "no operation" commands to fill in space until the sync happens between those two instructions. And that's exactly why sometimes lowering the clock can yield better performance in some workloads, and upping the clock yields no benefit or can worsen performance on these CPUs. Sync is more important than clock speed

In that case you increased the speed of the CPU, but it's just increasing the number of no operation commands needed because the other part of said command cannot go any faster.

^ The type of instructions that need synchronisation are almost always math instructions, esp. floating point, and also certain memory operations that need to be completed for the next instruction to be done.

CPUs function similarly to DNA in that there is predictability in what instructions are coming next. For example:

CPU does the work of 1 + 1 ... what is next?

1 + 1 = 2

^ There two values were added and a third resulted, after that result is gained what does the CPU expect to happen? The value will have to be stored somewhere or used. So it will expect a value to be stored or moved and it will wait until it sees an instruction that does that.

If not, then the instruction is going to be flagged.

Why that is important in the context of you and overclocking is that the CPU literally won't do anything faster depending on the command being used and how often.

Nearly every game will run those types of instructions and that's why overall the gain is minimal at best, but negative at worst.

You aint losing any noticeable performance.

I don't understand the logic in undervolting and downclocking, why not just buy a 7800x3d and save a hundred bucks? makes no sense to me.