Jethor Thor AGX Cuda core fp16 fma tops equal with fp32 fma tops ?

I have tested jethor thor AGX , I found the fp16 fma tops is about 8Tops, the same as fp32 fma tops .
this is very odd, I thought fp16 :fp32 is 2:1 as orin agx.
Can somebody explain this result on Jetson Thor Agx?