Granted this is liquid cooling but CRYORIG's upcoming LULL case does feature a passive cooling aspect. Its standout feature is a chassis-integrated liquid cooling plate, which acts as a large, passive cooling surface, eliminating the need for traditional fans to dissipate heat from the CPU. This heat sink measures approximately 400 mm x 400 mm x 30 mm and weighs about 3.9 kg, taking up almost the entire left side panel of the case.
Memory Lane: CRYORIG's 2017 April Fools' Day was actually amazing.