RTX 5090 Owner Mods 12VHPWR With Add-On Board, Splits Power Across Three Inputs; Wires Stay Under 40°C

A Reddit user known as u/DallasGrave attached an add-on board to the 12VHPWR header that draws power from two 8-pin PCIe connectors and spreads the load across three inputs instead of one. After 48 hours at 550W, wire temperature never exceeded 40°C, with each input carrying only 3A.

• Add-on board feeds from two 8-pin PCIe connectors and splits load across three inputs
• 48 hours at 550W: wires stayed under 40°C, 3A per input
• Mod targets 12VHPWR melting issues on the RTX 5090
• Long-term durability of the mod remains untested