For the GPU solving the installation of Cuda Driver is necessary, more information here.
To run an optimization on one or more graphics card(s) the solver priority can be set to GPU solving in the Application Settings - Generative Design Solver. The default solver setting is CPU. GPU solving should be preferred because of increased solving speed with the associated license.
Prior to the GPU solving the CPU threads should be defined because they are used to build up the FE-matrix and the set value is important for CPU as well as GPU computing. Afterwards the GPU solving can be activated and the number of GPUs can be added.
Further information here.
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