# Custom RTX 5090 Mod Splits 12VHPWR Power Input

October 3, 2026 at 08:45 PM

> A new custom add-on board for the RTX 5090 enhances safety by splitting power across three inputs to reduce connector temperatures.

Redditor **u/DallasGrave** has developed a custom add-on board for the [RTX 5090](<https://hardwarebrief.com/entity/geforce-rtx-50-series-q128210968>) designed to modify the **12VHPWR** connector. This hardware modification attaches directly to the header, splitting power across three separate inputs rather than relying on a single source.

The modification utilizes two standard 8-pin PCIe connectors for auxiliary power. During a 48-hour stress test at a 550W load, each input carried 3A while wire temperatures remained below 40°C. The RTX 5090 features 32GB of [GDDR7](<https://hardwarebrief.com/entity/gddr7-sdram-q120644315>) VRAM for high-end performance.

To further enhance safety, a developer released an open-source tool for **ASUS Astral** RTX 5090 variants. This software monitors power draw and automatically shuts down the PC if it detects excessive levels, complementing the physical hardware modifications.


[#RTX5090](<https://hardwarebrief.com/hashtag/RTX5090>) [#NVIDIA](<https://hardwarebrief.com/hashtag/NVIDIA>) #GPUModding [#PCGaming](<https://hardwarebrief.com/hashtag/PCGaming>) [#Hardware](<https://hardwarebrief.com/hashtag/Hardware>)

## Related news

## [Microsoft Expands ASD Support to NVIDIA and Intel](<https://hardwarebrief.com/article/microsoft-expands-asd-support-to-nvidia-and-intel-a8a9696b>)

October 2, 2026 at 02:33 PM

## [Nvidia Unveils $4,999 64GB DGX Spark Platform](<https://hardwarebrief.com/article/nvidia-unveils-4-999-64gb-dgx-spark-platform-ff999c6c>)

October 2, 2026 at 09:23 AM

## [Gigabyte Replaces Cracked RTX 5090 Waterblock](<https://hardwarebrief.com/article/gigabyte-replaces-cracked-rtx-5090-waterblock-b989e327>)

September 29, 2026 at 08:58 AM

## [RTX 5090 Connector Hits 91.7C in DLSS 5 Testing](<https://hardwarebrief.com/article/rtx-5090-connector-hits-91-7c-in-dlss-5-testing-92b81194>)

September 25, 2026 at 08:09 AM

## [Modders Enable Smooth Motion on RTX 30 GPUs](<https://hardwarebrief.com/article/modders-enable-smooth-motion-on-rtx-30-gpus-2a463f38>)

September 23, 2026 at 06:43 PM