Your desktop is bottlenecked. Laptop results look normal.
If you really have time to spare you can troubleshoot to see why. Check is other stuff writing to disk. One way is to do boot into safe mode and then run the benchmark again on your desktop
My desktop is 70% faster than the laptop. Desktop is I7 4770K.
So the laptop is the bottleneck.
I have send all info to Samsung. Will see what they say.