A recipe for disaster

We implore you to keep fanless graphics cards away from heat sink cases. Passively-cooled GPUs like the Palit KalmX series require maximum convection, and even open-air setup to function properly. In fact, unless costly solutions like the HDPLEX H5, Turemetal UP10 or MonsterLabo are involved, fanless discrete graphics are simply not recommended.

Source: ComputerBase