Key Takeaways
1. Power limits in gaming laptops often restrict GPU performance to prevent overheating and ensure stability.
2. A modder successfully used shunt modding on an RTX 4090 GPU to report lower power consumption, allowing the GPU to reach higher clock speeds.
3. The modification involved adding a 1 mOhm resistor to the existing 5 mOhm resistor, misleading the system about actual power usage.
4. Adequate cooling and a strong power supply are essential for this mod, as the true power draw can reach up to 240W.
5. While shunt modding can significantly boost performance, it carries risks of permanent damage and requires specialized tools to execute correctly.
Power limits often prevent a high-performance GPU from achieving its full capabilities. In gaming laptops, where space and cooling are restricted, strict power limits are typically enforced to avoid overheating and ensure stable performance. But what if there was a way to deceive the system into believing that the GPU isn’t hitting its power limit? A modder has found a method to do just that, achieving impressive performance boosts that sometimes surpass a laptop equipped with an RTX 5090.
The Modding Process
According to a post by ‘thatavidreadertrue’ on Reddit, the user implemented shunt modding on a Zephyrus M16 that houses an RTX 4090 GPU. Shunt modding involves physically altering a resistor on the GPU, allowing it to report a lower power consumption. This enables the GPU to achieve its full clock speeds. The modder placed a 1 mOhm resistor on top of the existing 5 mOhm resistor, causing the GPU to indicate it was using six times less power than it actually was.
Cooling and Power Supply Considerations
Naturally, this modification requires a robust cooling system and a strong power supply. The Redditor mentioned that the Zephyrus M16 has sufficient power phases, and they replaced the old thermal paste on both the CPU and GPU with a higher-performance option. As a result, the M16 was showing power usage between 40W to 45W, while the true power draw could reach up to 240W (the maximum of the power adapter).
Benchmark Results and Risks
The modder shared several benchmarks, including Speedway, Steel Nomad, Port Royal, and Time Spy. In most instances, as illustrated below, the modified M16 surpassed the typical performance of an RTX 5090 laptop.
While shunt modding can be effective, it carries risks and demands some specialized tools. If you consider attempting this, be aware that there is a possibility of causing permanent damage to the components. However, if done correctly, you could potentially achieve RTX 5090 laptop performance at just half the price.
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