i called him and ask for final price but no negotiation
then after 2 or 3 days ask again and only free shipping margin released
asked for some stress test and he provided and after that i transferred the amount
shipped the next day and i received the package next working day
checked the card but it was not working fine
turns out that my power supply is not working fine
then i verified with other power supply borrowed from friend
after confirmation of working i declared that the card is fine as expected
BIG THANX brother for everything and i am sorry for disturbance caused because of my power supply