There are many affordable mini PCs on the market for basic computing tasks. The Beelink SER7 Ryzen 7 7840HS Mini PC is designed to handle more resource intensive applications. It is powered by a 8 core processor with AMD Radeon 780M graphics that supports 4K video playback. You can connect this to 3 x 4K@144Hz screen.
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This particular model has 32GB RAM and 1TB NVMe SSD. It has WiFi 6 and Bluetooth 5.2 connectivity. It has 1 x HDMI, 1 x DP, 2 x USB and 2 x USB4 ports in the back and USB 3.2 and USB-C 3.2 ports in the front. It has a magnetic power supply.
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