At this point, it would be more surprising if someone hadn't heard about the melting cable problem that has long plagued NVIDIA's RTX 40 series and now the RTX 50 series. For every case of a melted connector, even on heavily underclocked cards, there has been a corresponding effort to address it, like the ROG Equalizer. But with results consistently landing in the "not a guaranteed fix" category, a modding group has decided the real solution isn't to push the 12V-2x6 design further, but to abandon it altogether.
Modders at Brazilian YouTube channel TecLab took an RTX 5090 and wired it to run on standard 8-pin Mini-Fit Jr. connectors. Their reaction to the results speaks for itself: "It's colder than the original connector, guys. Where is NVIDIA? Call NVIDIA, guys. Put the raw footage out there for people to see, otherwise they'll think it's a lie. This looks like a lie."
The experiment used a Galax HOF OC LAB RTX 5090, a card designed to use two 16-pin connectors. The modders stripped the card down to bare PCB and replaced the dual 16-pin connectors with three 8-pin PCIe connectors at the rear, each soldered directly to the power regulators using heavy-gauge cables. The Sense 0 and Sense 1 pins were also rewired to ensure the card could reach its maximum power load without restrictions. A liquid cooling system with a GPU block was used to manage temperatures.
Once everything was unlocked for higher power levels, the card was put through a one-hour livestream test. The modders gradually increased the power threshold from 400W to 900W (a single 8-pin PCIe connector is officially rated for just 150W). At its peak, the modified RTX 5090 operated at a load exceeding 120A at clocks of around 3,400MHz for more than an hour while cable temperatures barely exceeded 35 degrees Celsius.
The modders also tested the card with just two 8-pin connectors, which kept temperatures below 25 degrees Celsius while the card drew 66A at over 3,200MHz. Even a single cable managed 65A at 3,100MHz, and while that cable reached 91 to 92 degrees Celsius, it still didn't melt. For reference, the stock RTX 5090 boost clock sits at around 2,400MHz.
So yes, this demo by TecLab suggests that older 8-pin connectors are still a viable option for NVIDIA's power-hungry graphics cards. The 8-pin connectors proved not only stable but cooler than the 12VHPWR cable even when pushed beyond their official spec. The problem was never about how much power the card needs. It was about the connector chosen to deliver it. No BIOS or software tweaks were involved, keeping the mod entirely at the hardware level.
Frequently Asked Questions
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What temperatures did the modified RTX 5090 cable and connector reach at 900W, 2-connector, and single-connector testing?
Why did the modders replace the card’s dual 16-pin connectors instead of trying to improve the 12V-2x6 design?
Could this 8-pin connector approach be used on other NVIDIA RTX 50 series cards, or was it specific to the Galax HOF OC LAB design?
What does this TecLab test imply for AIBs still using 16-pin power connectors on RTX 5090 cards?
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Whether this sends AIBs back to 8-pin connectors is unlikely given the investments already made in the 16-pin ecosystem. But it should give NVIDIA reason to reconsider its connector choices. Just days before this video, TecLab demonstrated another solution by routing power wiring directly to the GPU's PCB, though neither modification is something most gamers should attempt at home. What matters is AIBs taking notice and doing the job for us, especially since the melting connector problem is no longer exclusive to NVIDIA, with certain AMD Radeon 90 series cards also at risk.
