It´s seems there are BUGs for multi GPU in the latest whgl driver of AMD. Only 4 GPU of 5 are correct recognized. The Catalyst 12.6 has done that correct.

The first call to clGetPlatformIDs(0, NULL, &numPlatforms); crashes like described before in the discussion:

clGetPlatformIDs() crashes with 5 GPUs Catalyst 12.6 whql

but it happens more often now. It crashes again in the aticaldd64.dll.

Is their an explicit testing for OpenCL applications with multi GPU configs (more than 4 GPU) at AMD side, because that errors happens since the new CGN architecture is released. That is my fourth post to that theme and I not the alone with that problems.

My Machine config is:

HP Z820

5x HD 7950 - four in a Cubix GPUXpander.

64GB RAM

Windows 7 Ult x64

Best regards Nils.