Using GPU acceleration in ABAQUS 6.13

I'm trying to use GPU acceleration in ABAQUS 6.13 but it seems that ABAQUS is not using the GPU for the calculation (the load on the GPU remains at 0%). I have a NVIDIA Tesla C2070 as GPU. When I look in the logfile everytime I try to enable GPU accelaration I got a notice in the logfile: Could not find: clCreateSubBuffer. This notice come right after the run standard.exe line. So did I miss something in the configuration of the system? Or a there any suggesions how a GPU useable Job must look like?