Several NVIDIA PCB prototypes for RTX 5090, RTX 4090 & older GPUs have been spotted, featuring up to four 16-pin connectors.
NVIDIA Went A Little Overboard With The Power Delivery of Its Internal GPU PCB Prototypes, Up To…
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https://wccftech.com/nvidia-four-16-pin-connectors-gpu-prototypes-rtx-5090-rtx-4090-up-to-2400w-power/