Can My Older 650W PSU Power a New GPU With a 16-Pin Connector?
Asked by
MellowPine42
I have an older EVGA SuperNOVA 650 G3 power supply (model 220-G3-0650-Y1) and am considering upgrading to a Radeon RX 9070 XT or GeForce RTX 5070 Ti. These newer graphics cards use a 16-pin power connector, and the included adapter appears to convert three 8-pin PCIe plugs into the 16-pin connector. My PSU only seems to have two PCIe cable connections available. Can I safely use this adapter with my current power supply, or should I replace the PSU first?
Answers
That EVGA model has three PCIe connectors distributed across its two modular cables, so it may provide enough plugs for a three-8-pin adapter. Still, check the PSU manual and use the original PCIe cables—not CPU/EPS cables—and make sure every connector is fully seated.
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Many standard RX 9070 XT models use two 8-pin connectors, while factory-overclocked versions such as some premium designs use three. Choosing a two-connector model would make compatibility with your current cabling simpler.
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I would replace the PSU at the same time as the GPU. Use a current, reputable model with enough wattage and the correct native cable for the graphics card. That removes uncertainty around adapter loading, cable configuration, and transient spikes.
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The bigger concern is the 650W capacity, not just the connector count. Modern GPUs can have short power spikes, and AMD commonly recommends a higher-wattage supply for the RX 9070 XT. A quality 750W–850W PSU with native, appropriate connectors would give you more headroom and avoid relying on adapters or daisy-chained leads.
QuietHarbor53: Even if the existing cables technically fit, replacing the PSU seems like the safer choice when the graphics card is such a large part of the system cost.
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TidyOrbit8: I thought daisy-chaining PCIe connectors was generally discouraged. Is it actually safe here, or should each plug come from a separate cable?