Modders Rewire RTX 5090 to Draw Power From Multiple 8-Pin PCIe Connectors

A group of modders has modified a graphics card's power delivery design so that the NVIDIA GeForce RTX 5090 no longer uses its original 16-pin power connector, instead drawing power from traditional 8-pin PCIe power connectors. The RTX 5090 has a design power draw of 575W and requires a purpose-built high-power connector to receive sufficient power. NVIDIA introduced the 12VHPWR connector during the RTX 40 series for high-power graphics cards, but in real-world use the connector and cables overheated, melted, and in some cases burned. NVIDIA later improved the design with the 12V-2x6 connector, including redesigned contacts and a revised detection mechanism.

The 16-pin high-power connector has installation requirements, including fully inserting the plug, avoiding excessive cable bending, and ensuring a secure connection. A single traditional 8-pin PCIe connector can supply only limited power. This modification did not use a simple 16-pin-to-8-pin adapter cable, because passing a large amount of power through a single traditional 8-pin connector would exceed its design capacity. Instead, the modification redistributes the input power the card requires, spreading the supply demand originally concentrated in one 16-pin connector across multiple 8-pin PCIe connectors, with several independent connectors and their cables jointly carrying the RTX 5090's power draw.

From an electrical standpoint, this approach does not give a single 8-pin connector the ability to supply 575W; rather, it increases the number of connectors to lower the current borne by each connector and cable. The power delivery path, the connectors, and the copper traces and power components on the PCB must be able to withstand the corresponding load. A traditional 8-pin PCIe connector is typically designed to provide around 150W of rated graphics card power, and a card can also draw additional power from the PCIe slot. For an RTX 5090 with a 575W power draw, relying entirely on traditional connectors would require multiple independent 8-pin connectors.

The modification directly alters the card's power delivery structure, feeding multiple power inputs into the graphics card's power system and distributing current so that no single connector is overloaded. The modified RTX 5090 no longer relies on the original single 16-pin high-power connector, instead receiving power through multiple traditional 8-pin connectors. This modification does not reduce the RTX 5090's actual power consumption, and the whole system still needs a power supply capable of stably delivering several hundred watts of GPU power. With its power limit removed, the RTX 5090 can consume more than its default 575W, and the power connectors, cables, PCB, and the power supply itself all need to withstand higher loads.

NVIDIA adopted the 16-pin connector to provide higher power density within a limited connector volume. Compared with using four or more 8-pin power cables, one 16-pin connector can reduce the number of cables inside the chassis. The higher the power density, the greater the demands on connector contact quality and installation precision. Melting cases have occurred previously.

The modified card has more power cables at its rear, taking up more space inside the chassis and reducing cable management and visual cleanliness. The 16-pin connector was designed to carry relatively high power in a compact connector.