How to Undervolt a Gaming Laptop CPU and GPU

What undervolting means

Undervolting is the practice of lowering the voltage supplied to a processor below the factory default. The processor keeps its clock speed, so its performance potential stays the same, but the electrical pressure is reduced.

Less voltage means less power draw. Less power draw means less heat to remove. In a laptop, the cooling system has a fixed capacity, so reducing heat output gives that system more room to work.

This is a software or BIOS-level change, not a physical modification. You adjust a setting and the processor runs at a lower voltage from then on.

• Overclocking: clock speeds stay the same.
• A physical change: you adjust a setting in the BIOS or software.
• A guarantee of a specific temperature drop: results depend on the laptop's cooling design.

Why gamers undervolt a laptop

A gaming laptop packs a high-performance processor and a discrete GPU into a small chassis. The cooling system has to keep both within safe limits, and the fans spin faster when heat builds up.

When you play a large, detailed game for a long session, the CPU and GPU work at high load. The heat they produce makes the fans spin at high speed, which is audible in the room.

By lowering the voltage, you reduce the heat the silicon produces at the same clock speed. The cooling system then has to move less heat, so the fans can run at a lower speed during your sessions.

The goal is to keep most of the gaming performance while making the laptop easier to live with. If you play large single-player worlds, the AAA game laptop guide is a good place to see your GPU options.

CPU undervolting and the Intel HX suffix

Not every laptop processor allows you to change its voltage. Intel's naming guide describes the mobile suffixes as follows: HX and HK are 'Highest performance, all SKUs unlocked'; H is 'Highest performance'; P is 'Performance optimized for thin and light laptops'; U is 'Power efficient'.

The unlocked HX and HK labels are what make undervolting possible on the CPU side. An unlocked processor lets you change voltage settings in the BIOS or through a vendor utility.

If your gaming laptop has a processor with the H suffix, the Intel guide does not describe it as unlocked, so your voltage options may be limited. Check your laptop's BIOS to see whether voltage control is present.

For a deeper look at the difference between HX, H and U laptop processors, read the HX vs H vs U comparison.

GPU undervolting and NVIDIA Max-Q

On the GPU side, NVIDIA describes its Blackwell Max-Q technology as 'Maximum power efficiency' on GeForce RTX 50 Series laptop GPUs. The vendor already optimizes power at the factory so the laptop runs within its cooling capacity.

Undervolting a laptop GPU is an additional step on top of that factory optimization. You lower the voltage curve of the GPU in a vendor tool or a tuning utility, which reduces heat output while the clock speeds stay close to their normal range.

The RTX 50 Series naming covers multiple tiers, and the Max-Q optimization applies across the line, so the approach is the same whether you have an entry-tier or top-tier RTX laptop GPU. See how RTX laptop GPU model numbers work and what Max-Q means.

How to undervolt, step by step

Start in the BIOS or in the laptop maker's performance software. Look for a voltage or core voltage setting. Some vendors expose it clearly; others hide it under an overclocking or advanced menu. The performance software guide explains where these tools live.

Lower the voltage by a small step from the default value. The size of the step depends on the tool you use, so keep it small and do not jump past a stable setting.

After each step, start a game or a demanding workload and let it run for a while. The goal is to see whether the system stays stable at that voltage. If it crashes, freezes, or shows errors, raise the voltage back to the last stable setting.

When you find a setting that stays stable, save it in the BIOS or the vendor profile so it applies on the next boot. Keep a record of the voltage value and the result of each check. You can confirm the BIOS version before you start with this checklist.

Watch for instability

A voltage that is too low makes the processor unable to complete its work reliably. The first sign is usually a crash or a freeze during a heavy load, not during light use.

If you see errors after lowering the voltage, the setting is below what the silicon needs. Raise the voltage one step and try again.

Not every laptop lets you undervolt. Some BIOS versions lock the voltage controls. If the setting is missing, you can still reduce heat in other ways, like adjusting the fan curve or limiting the processor's power in the Windows power plan. See how to adjust fan curves and how to configure power plans.

When undervolting makes sense

Undervolting is most useful for a laptop that you use for long sessions in a small room, where fan noise is easy to notice. It is also useful if you carry the laptop to a friend's place or a LAN event and want it to run more quietly. The noise level guide helps you understand what to expect.

It makes less sense if you are happy with the laptop's behavior out of the box. The vendor's Max-Q and unlocked settings already manage power, so undervolting is an optional tuning step.

If your laptop runs a top-tier GPU and a high-core-count CPU, the cooling system has more heat to move, so the voltage reduction has a larger effect on the heat the cooling system has to handle. The thermal behavior guide covers this in more detail.

What to pick for your play

Questions

Is undervolting the same as overclocking?

No. Overclocking raises the clock speed to get more performance. Undervolting lowers the voltage while keeping the clock speed the same, so the processor draws less power and produces less heat.

Can I undervolt both the CPU and the GPU in the same laptop?

Yes. The CPU voltage is usually adjusted in the BIOS or a vendor utility, and the GPU voltage is adjusted in the vendor's performance software or a tuning tool. Each uses its own setting. See the performance software guide for where these tools live.

Will undervolting reduce my gaming performance?

The clock speeds stay the same, so most of the performance remains. If the voltage goes too low, the system becomes unstable, so you stop at the last stable setting and keep the performance you need.

What does the Intel HX suffix mean for undervolting?

Intel describes HX and HK as 'Highest performance, all SKUs unlocked.' That unlocked status is what lets you change the CPU voltage. H, P and U suffixes are not described as unlocked in the Intel naming guide.

What if my laptop does not have voltage controls?

Some laptops lock the voltage settings in the BIOS. You can still reduce heat by adjusting the fan curve or limiting the processor's power in the Windows power plan. See how to adjust fan curves.

Does undervolting change the Windows 11 requirements?

No. Undervolting is a hardware-level adjustment. Windows 11 still requires a graphics card compatible with DirectX 12 or later with a WDDM 2.0 driver, which your gaming laptop already has.