Look for nvcc in the 32 bit bin directory before the 64 bin directory.

Modules/FindCUDA.cmake

@@ -469,8 +469,8 @@ endif (NOT CUDA_TOOLKIT_ROOT_DIR)
 # CUDA_NVCC_EXECUTABLE
 find_program(CUDA_NVCC_EXECUTABLE
   NAMES nvcc
-  PATHS "${CUDA_TOOLKIT_ROOT_DIR}/bin64"
-        "${CUDA_TOOLKIT_ROOT_DIR}/bin"
+  PATHS "${CUDA_TOOLKIT_ROOT_DIR}/bin"
+        "${CUDA_TOOLKIT_ROOT_DIR}/bin64"
   ENV CUDA_BIN_PATH
   NO_DEFAULT_PATH
   )