The core of the mod is a single-slot RTX 4070 "Laptop-on-Desktop" GPU. These cards are often sourced from Chinese markets (like Taobao). They use the power-efficient RTX 4070 mobile chip soldered onto a custom desktop PCIe PCB. This redditor removed the original small, loud fan and adapted the massive Palit KalmX heatsink to fit, achieving solid gaming performance in a system with zero moving parts.
Source: reddit
