OpenCL is only outwards i.e. CPU at center and throwing its work/load on other people's (components' e.g. DSPs, IBM-Cell, Physx etc) shoulders. Where MS-DX11 is capable of processing load both inbound and outbound i.e. it can make CPU work as GPU i.e. instructions-wise your CPU can be Geforce, Quadro, Radeon, FireGL, Chrome, Matrox, Cell, Physx.

So additional load will result in higher GPU temps, so will Snow Leopard cause more MacBooks/MacBook Pros to fail?