http://www.amazon.in/Asus-R558UQ-DM513D-Screen-Laptop-Graphics/dp/B01MRKP1XP ..this laptop has 4gb ddr4 2133mhz soldered onboard ..n has a single slot tht takes upto 16 gb ddr4 2133mhz so would there be any problem...if i add a 8 gb 2133mhz ddr4 in the slot....?