Get the exact connector type, cable count, adapter guidance, PSU wattage verdict, and 12VHPWR safety notes for your card.
Both are 16-pin connectors rated to 600W. The original 12VHPWR (RTX 40, 3090 Ti) had melting reports tied to partial seating. The revised 12V-2x6 (RTX 50) shortens the four sense pins and lengthens the conductor terminals so a not-fully-seated plug simply won't power on.
A 600W connector carries up to ~50A across six 12V pins. If the plug is even slightly loose, current crowds onto fewer pins, resistance rises, and the plastic can melt. Push until it clicks and keep the cable straight for the first 35mm.
If your PSU is ATX 3.0/3.1 it ships with a single native 16-pin cable - always prefer it over the multi-8-pin adapter bundled with the GPU. On an older ATX 2.x PSU you must use that adapter; upgrading to an ATX 3.1 unit removes the extra failure point.
Modern GPUs draw brief spikes far above their rated TGP - an RTX 4090 can hit ~600W for microseconds. ATX 3.0/3.1 PSUs are certified to handle up to 200% excursions, which is why they're recommended for high-end cards even when the average draw looks modest.
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