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int dev;
cudaDeviceProp devProp;
cudaGetDevice(&dev);
cudaGetDeviceProperties(&devProp, dev);
printf("Name: %s\n", devProp.name);

Потому что казалось бы:

cudaError_t cudaGetDevice( int* dev )
DESCRIPTION
Returns in *dev the device on which the active host thread executes the device code.

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