Yes, you may use a matched pair of two x 16 GB sticks in your Vostro 3520. Here are some Crucial memory sticks that are guaranteed compatible with your system. Follow the disassembly and reassembly steps in Dell's Service Manual. Whenever touching components or working inside a computer, wear a grounded wrist strap, also called anti-static wrist strap, ESD wrist strap, or ground bracelet. It's a cheap and sensible precaution. Rest the laptop on an anti-static mat or at least a reasonable alternative such as corrugated cardboard.
    I have recently purchased a Dell Vostro 3520 laptop. It came with 16GB (2x8GB 3200MHz KRVFX) of ram. Can this laptop be upgraded to 32GB of ram? I have seen that the laptop has two slots for memory chips and it can accept 16GB chips. So my question is whether there are other hardware limits that would prevent the use of two 16GB memory chips?
Vostro 3520, memory upgrade?