Open mining frame designed to align with the standard hole pattern of motherboard, graphics card, hard disk, and power supply. It supports installing up to 4 cooling fans for effective cooling and reliable operation of the equipment. Heat dissipation: engineered by miners to optimize heat removal, enhance GPU cooling, and prolong graphics card life. GPU slots: 6 GPU slots (not including GPU). The spacing between slots is 81 mm (3.19 in). Graphics card length specification is not provided. Easy installation: the stackable computer rack has a strong structure that helps keep cables organized and secures all components of the mining machine. Use scenarios: Build a multiGPU mining rig for cryptocurrency mining with efficient cooling and tidy cabling. Expand an existing mining setup with a scalable frame to accommodate additional GPUs while maintaining and airflow. Set up a compact, testfriendly GPU rack in a lab or workshop for hardware benchmarking and evaluation.