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According to this Dell site, https://www.dell.com/support/manuals/us/en/04/xps-8920-desktop/xps-8920-service%20manual/system-board-components?guid=guid-09138897-cbe9-49c8-b4ba-9882357209cf&lang=en-us, your computer uses an ATX power supply so you should be good.
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