Can an older 650W PSU power a GPU with a 16-pin connector?
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MellowPine42
I have an older EVGA SuperNOVA 650W power supply, model 220-G3-0650-Y1. I'm considering upgrading to an RX 9070 XT or RTX 5070 Ti, and these newer cards use a 16-pin power connector. The graphics card includes a 16-pin-to-three-8-pin adapter, but my PSU appears to have only two PCIe cable connections available. Can I safely use the included adapter, or should I replace the power supply with a newer, higher-wattage model?
Answers
That PSU model has three PCIe connectors available across its two modular cables, so it may be compatible with the included three-8-pin adapter. However, check the exact cable layout and make sure you’re using the original cables for that power supply. Avoid mixing modular PSU cables from different models.
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Even if the existing PSU can technically provide the required connectors, using the proper native cable and sufficient wattage is the safer long-term choice. The cost of a good PSU is small compared with the GPU, motherboard, or other components that could be damaged by an inadequate or overloaded power setup.
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I’d strongly consider replacing the PSU anyway. A 650W unit may be borderline for a modern high-end GPU, especially with transient power spikes. A quality 750W–850W unit with a native 16-pin GPU cable would provide more headroom and avoid relying on a daisy-chained adapter.
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Some RX 9070 XT versions only use two 8-pin connectors, while factory-overclocked models such as the higher-end variants may need three. Choosing a two-connector model would make your current cable setup simpler, though the 650W capacity could still be marginal.
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