Question Undervolting my Ryzen 7 7800X3D

[Parv patel]

I want to undervolt my cpu curve by -20 to -30. What should I change my PPT, TDC, and EDC to in my bios settings?

• CPU: AMD Ryzen 7 7800X3D
• Motherboard: ASUS B650-E TUF Gaming
• RAM: G.SKILL Flare X5 Series 32GB DDR5 6000 Kit
• GPU: ASUS NVIDIA GeForce RTX 4080 Super ProArt Overclocked Triple-Fan 16GB GDDR6X PCIe 4.0 Graphics Card
• PSU: CORSAIR RM850x

 

[Lutfij]

You could start with Curve Optimizer and then tweak things afterwards.

 

[CountMike]

I want to undervolt my cpu curve by -20 to -30. What should I change my PPT, TDC, and EDC to in my bios settings?

• CPU: AMD Ryzen 7 7800X3D
• Motherboard: ASUS B650-E TUF Gaming
• RAM: G.SKILL Flare X5 Series 32GB DDR5 6000 Kit
• GPU: ASUS NVIDIA GeForce RTX 4080 Super ProArt Overclocked Triple-Fan 16GB GDDR6X PCIe 4.0 Graphics Card
• PSU: CORSAIR RM850x

What are you trying to achieve, performance or temperature reduction ? If you have good cooling, you don't need negative CO, that's only used to control temps.

 

[Parv patel]

You could start with Curve Optimizer and then tweak things afterwards.

I'm new to this stuff so idk what numbers are default and stuff like that

 

[Parv patel]

What are you trying to achieve, performance or temperature reduction ? If you have good cooling, you don't need negative CO, that's only used to control temps.

So I did a test, and my CPU was at like 4.7 GHz, so I changed the curve to -20, and it improved it. I think it's it thermal throttling a little.

 

[CountMike]

So I did a test, and my CPU was at like 4.7 GHz, so I changed the curve to -20, and it improved it. I think it's it thermal throttling a little.

In that case, you have to lower power available for CPU, start by lowering TDP first.

 

[Parv patel]

In that case, you have to lower power available for CPU, start by lowering TDP first.

I'm a noob when is comes to this. What numbers should I start with?

 

[geofelt]

I'm a noob when is comes to this. What numbers should I start with?

If you have little expertise, I would not fool with voltages.
Your processor is already a well performing one and you are unlikely to see any benefit without a synthetic benchmark.

 

[Roland Of Gilead]

In the Curve Optimizer (CO) Section of your bios, there will be an option to use the negative undervolt. You can do it all core or per core.

Simply choose an offset Positive or Negative (negative in your case) and set it to -10. Start there. Reboot, test with CB R23 and note down your scores and temps.

Then go back and set the offset to -20, wash, rinse, repeat. You do not need to touch any voltage settings to do this. This is why we have CO.