What We Know About the RTX 5090's Dual 8-Pin Power Mod

An RTX 5090 owner modified the card's power input by adding two additional 8-pin connectors through a custom daughterboard, according to a report from TweakTown. The mod reportedly brought cable temperatures on the card below 40°C, TweakTown reported.

What did the RTX 5090 owner change?

The modification centers on a daughterboard, a small secondary circuit board wired into the GPU's existing power input, that accepts two extra 8-pin PCIe connectors beyond the card's stock power hardware, per TweakTown's report. The owner's goal, as described in the coverage, was to spread the card's power draw across more connectors and cables rather than concentrating it on the factory configuration.

How does the daughterboard mod work?

TweakTown's report identifies the daughterboard as the physical piece that lets the two added 8-pin cables tie into the RTX 5090's power path. The report does not detail the board's manufacturer, wiring schematic, or whether it is a commercially available part or a one-off build, so those specifics remain unconfirmed based on the available reporting.

What result was reported for cable temperatures?

The headline result cited by TweakTown is a drop in cable temperatures to below 40°C after the mod was installed. The report attributes that figure to the owner's own testing; no independent lab verification of the number is referenced in the available coverage.

Has Nvidia or any board partner responded?

Nothing in the available reporting indicates that Nvidia or any add-in board partner has commented on this specific modification. The mod appears to be an individual owner's project rather than a vendor-sanctioned change, based on how TweakTown framed the story.

Why does cable temperature matter for a high-end GPU?

High-wattage graphics cards route significant current through a small number of cables, and keeping those cables and connectors cool is a routine concern in high-performance builds. A separate Gaming Gear Expert guide on desk cable routing notes that cable management choices affect both airflow and connector strain inside a case, a general consideration that applies whether or not a card has been modified. That guide does not address the RTX 5090 mod specifically, and TweakTown's report is the only source describing the daughterboard project itself.

What should RTX 5090 owners know before trying something similar?

The available reporting covers one owner's result and does not include independent confirmation, long-term testing, or safety guidance from Nvidia or a cable manufacturer. Readers considering a similar project have, based on what has been published so far, only a single documented outcome to go on rather than a vetted or widely replicated procedure.