I installed an RX 9070 XT while still using my older 550W Cooler Master Bronze power supply. I knew it was probably underpowered, so I ordered an 850W replacement. Before stopping, I tested a few games and the computer suddenly shut down and restarted about five times. It still boots normally and works fine outside of gaming, with no obvious GPU problems. I have stopped using it until the new PSU arrives, but could those shutdowns have damaged the graphics card or other hardware?
4 Answers
If the power supply is functioning properly, an overload will usually trigger its protection circuitry and shut the system down rather than damage the GPU. Since the card still works normally, permanent damage is unlikely. Waiting for the replacement before gaming again is still the sensible choice.
Sudden power loss can potentially corrupt files or Windows data, even if it does not physically damage the GPU. If your processor has integrated graphics, you can use that temporarily, or simply leave the computer off until the replacement PSU is installed.
An 850W unit should be plenty for that card, assuming it is a reputable model. Use only the PCIe cables that came with the new PSU—modular cables are not interchangeable between power supplies, even if the plugs fit. Also make sure the GPU power connector is fully seated.
The shutdowns may not be caused solely by wattage. A loose GPU power connector, insufficient airflow, a faulty cable, or a PSU protection issue can all cause a complete restart under load. Check the connector and cooling once the new unit is installed, and avoid using the old PSU for gaming in the meantime.
A defective or very poor-quality PSU is less predictable, so the exact model matters. But a normal protective shutdown is generally much safer than continuing to run an overloaded system.