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
What is the difference between an external power supply and one that is built into a motherboard? - Quora
Aerocool Integrator 500W 80 Plus Bronze Power Supply | OcUK
Eurocom Launches a 780 W External PSU for Laptops
Seasonic SSP-500ES2 500W Bronze ATX PS/2 80mm fan power supply PSU – Overtek
Server Housing ATX Eatx Rolls 500W Power Supply Main Board > 30x33cm 12x13 " MM | eBay
Power supply unit (computer) - Wikipedia
Cronus FX PRO 500W 140mm Silent Fan 80 PLUS Bronze PSU Powersupply - TechNextDay
Nova 600W External Semi-Fanless PSU
Reliable Wholesale 500w External Power Supply To Prevent Damage To Computers - Alibaba.com
Power Supply Adapter Supplier, Laptop Charger Adapter | Fuyuan
Aero Cool Integrator 500W 80+ PSU
Black 500W Desktop PC Power Supply ATX Computer PSU 500 Watt SATA 12CM Fan UK | eBay
The SilverStone FX500 Flex-ATX 500W PSU Review: Small Power Supply With a Big Bark
OSHKI Outdoor Portable Power Station, AC Power Bank,567Wh 500W Travel Portable Charger, Fast Charging External Battery Pack, Emergency Power Supply for Travel And Camping : Amazon.co.uk: Garden
Builder Series 500W ATX PSU, 12cm Fan, 3 x SATA, ATX-500B
Aerocool Integrator 500W 80 Plus Bronze Power Supply | OcUK
Modular Flex Atx Psu Pc Power Supply Flex Psu 500w 1u K39 600w Switching Power Supply Enp-7760b Enp 7660b - Pc Power Supplies - AliExpress
Elite 500W V3 Active PFC ATX PSU | Cooler Master
be quiet SFX-L 500 Watt Full Modular 80+ Gold SFX PSU/Power Supply LN95467 - BN238 | SCAN UK