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I have a PCIe slot on my motherboard with a 25W power limit and I want to add either an RX 570 4GB (~150W) or a Radeon HD 7950 3GB 3GB (~200W), I’m not yet sure which one, but most likely the RX 570. I won’t be switching my motherboard or PC due to costs so that’s not an option (please don’t suggest this). I want to connect the GPU to the 25W PCIe slot and use the 4/6pin (or whatever) PCIe connector from the PSU. Would the 4/6pin cable provide the extra 50W needed that the PCIe slot isn’t giving and allow it to boot and function normally? Or would the GPU be expecting 75W from the PCIe slot and not work even if the 4/6pin cable is providing enough power to cover the rest of the GPU’s TDP? Thanks
@lordvader66 … youll want to change your power supply. your wanted graphics card upgrade requires 150w. if youre power supply only pushes 25w on the 4 pin and 50w on the 6 pin… you said it, its only supplying 75w. your card will try and pull the extra current through from your under rated power supply. youre either going to burn up your power supply and/or damage your graphics card when it does burn/short out. i would double check your power supplies specs, list your model here and apply ohms law to figure out what youre really able to push out.
