Normally you don't have to specify the type of GPU. But if in the future there are different kind of GPUs in a single machine or you want to run on a certain type of GPU you have to specify on which GPU you want to run, for example:
Normally you don't have to specify the type of GPU. But if in the future there are different kind of GPUs in a single machine or you want to run on a certain type of GPU you have to specify on which GPU you want to run, for example: