"i have downloaded the latest driver but when i try to get the rating, my pc will shutdown."
That concerns me, I can only presume the power draw kills your PC. Or heat. Can you please make sure your GPU fan is spinning?
Can you please also make sure your GTX has the supplementary 6 pin power plug plugged into the side/rear of the card?
Can you please advise when you last reinstalled windows?
The fan is working.
I mean i format my pc after adding new motherboard and processor, yes, the 6 pin power plugged were inside the side/rear of the card.
Would it be the GPC malfunction?