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You will want to get a high wattage itx powersupply. They are smaller which will give you more room for a gpu. The Apevia ITX-PFC500W Mini ITX/Flex ATX / 1U 500W Fully Modular Power Supplyhttps://a.co/d/00wfHuBgAs well as Dell uses proprietary power connectors so you’ll need a 24 pin to six pin adapter because your model uses a six pen for power. So you would need something like this. https://a.co/d/0dm5AmsbCheer 🍻
I threw this 4.5L ITX build (Steam Machine is 3.8 L in size) together roughly to show some friends a comparable SFF DIY system which is prob closer to the original planned $800 and around the specs of it from what I saw comparing some benchmarks in performance. https://pcpartpicker.com/list/cHfYNp Can definitely optimize other parts with the extra money, and I found a better modular flex PSU on Amazon for $50 USD that isn't listed here also. https://www.amazon.com/Apevia-ITX-PFC500W-Modular-90-264V-Computer/dp/B0CWN59YCZ I feel like this would be a reasonable ITX comparison, also the case still looks aesthetically pleasing to be in a living room environment imo.
I've been using this PSU: Apevia ITX-PFC500W Mini ITX/Flex... https://www.amazon.com/dp/B0CWN59YCZ?ref=ppx_pop_mob_ap_share Thermals still aren't perfect but I've managed. Although, I know Enhance is a more reputable brand so I'd be surprised if you have a defective unit. Might have something to do with the temp of the room you have your pc in? Have you tried undervolting your GPU and creating a custom fan curve?
The thing about rated specs is that they’re BS unless they’re from a reputable brand. Even a reputable brands specs are going to be a maximum and not intended for continuous use. 12V 18A is 216W (P=V*I). That’s too little to power it for gaming according to the documentation. It says 250W minimum, with 300W recommended. That’d be 12V at 21-25A and you likely want to over spec so we usually suggest a 500W power supply, like this one.