You know what’s ridiculously expensive these days? RAM. You know what isn’t? A broken phone on eBay. ETA PRIME spent under $70 on a Samsung Galaxy S20 FE with a busted screen, stuffed it into a Raspberry Pi tower case, and ended up with a mini PC that boots into Samsung Dex and runs Steam games. It sounds like the setup to a joke. It very much is not.
The Snapdragon 865 inside that cheap, busted Galaxy handles more than you would expect. Game Native connects it straight to your Steam library, PS2 and GameCube emulation run well, and Minecraft performs so smoothly ETA PRIME had his Xbox controller paired over Bluetooth within minutes. The whole thing costs less than a single night of impulse online shopping, which makes it either a genius budget build or a very convincing argument to check your eBay saved searches.
Designer: ETA Prime
One Samsung Galaxy S20 FE with a broken screen runs about $70 on eBay. Add an aluminum Raspberry Pi tower case from Amazon, a USB-C to HDMI adapter, and a fan cooler strapped to the back for $10 to $15, and that is the entire bill of materials. ETA PRIME disassembled the phone and fitted the internals directly into the case, but he is clear that you can skip all of that, prop the phone on a stand, connect it to a dock, and get the identical Dex experience without touching a screwdriver. The screen, even busted, stays connected and functions as a secondary interface. Units with minor burn-in but an intact display are sitting at around $99 unlocked on eBay, fully updated with a security patch from October 2025.
Out of the box, the S20 FE runs Dex at 1080p on an external display. Install Good Lock from the Galaxy Store, grab the MultiStar plugin, enable high resolution for external displays, restart Dex, and the resolution options expand to 1440p, 1200p in 16:10, and 21:9 widescreen at 2560×1080. Windows resize, snap side by side, and you can run five apps simultaneously, more if you unlock it through MultiStar, though 6GB of RAM will start making its feelings known past a certain point. Chrome scales to a full desktop layout. So does Google Play. On a 1440p monitor this setup looks genuinely clean.
Hollow Knight: Silksong runs well on the 865. Left 4 Dead 2 was still downloading during ETA PRIME’s walkthrough but is expected to perform. Cyberpunk 2077 at 60fps is a non-starter on this chip with 6GB of RAM, and he says so without hedging. PS2 emulation through NetherSX2 puts God of War 2 at 2x resolution scale with occasional frame dips, 1.75x is the more stable setting. GameCube and Wii hold up across most titles, with demanding stages in games like F-Zero GX pushing the limits when upscaling is involved. Dreamcast, PSP, and Sega Saturn run clean.
A Galaxy S21, S22, or S23 gives you better RAM configurations and newer Snapdragon silicon if you want more ceiling. The S24 and S25 are still priced too high to make the economics work. The S20 FE sits at the right intersection of price, performance, and availability right now, and the Snapdragon 865 is old enough to be cheap but capable enough to handle a surprisingly wide range of workloads without flinching.
The full build walkthrough has not been posted yet. ETA PRIME recorded the entire process, around three and a half hours of footage, and has said he will publish it on YouTube if there is enough interest in the comments. Given how much this build has going for it, that video getting made feels like a matter of when.
The post The Cheapest Mini PC Costs Under $100 And Uses An Old Samsung Phone to run Steam and PS2 Games first appeared on Yanko Design.