Custom case can't keep its cool

This nice looking system features a Ryzen 5 3400G nested in a dangerously small 237 × 210 × 115 mm solid aluminum chassis. At 5.7L the system is almost the size of the backpack-friendly Ghost Canyon NUC.  Temperatures and performance are initially acceptable. However, upon encountering FurMark the 65W processor inevitably reaches 95°C and throttles down. Great passive cooling is a lot harder than it looks.

Source: taobao