How to power a 75watt 750ti that draws power from the pcie slot when the pcie slot only supplies 35watts?

Oct 11, 2018
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Hey all. My new 750ti (no power directly from power supply) should be here today and I am concerned because I only recently learned that on my optiplex 790 the x16 pcie slot only supplies 35watts. I know pcie risers are an option, but that concerns me as I don't even know if that will fix the power problem and I don't want to lose performance from lower bandwidth.

My budget is 20$.