Which Dell Optiplex MT (any model 990, etc.) can I change the graphics card without upgrading the PSU? Which GPUs would work? - Quora
Vostro 3470: how to upgrade the 200w power supply? - Dell Community
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Solved: Need PSU upgrade for Dell 3880 - Dell Community
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ATX 24 pin to 6pin Power Supply Cable for DELL Inspiron 3470 Optiplex 5050 7040 | eBay
400W ATX Dell Computer Power Supply - Dell® Replacement Power Supplies | StarTech.com
Amazon.com: COMeap 24 Pin to 6 Pin ATX PSU Power Adapter Cable for Dell Motherboard with 6 Pin Port 13.3-inch(34cm) : Electronics