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A computer tower needing an external power supply. There is nothing behind the power supply "cutout". Basically a laptop motherboard in a case. Also, the card slots aren't removable. : r/techsupportgore
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Amazon.com: PC PSU DC 12V Input 300W Output Computer Power Supply Module Board with 24Pin Connect/AUX/SATA Cable, Suitable for MiniITX and 1U Case : Electronics
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Multi-hard Disk Power Supply Module Computer Power Supply Synchronous Hard Disk Power Supply Board Dc Input Hard Disk Hdd Ssd Ex - Pc Hardware Cables & Adapters - AliExpress
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