New
#11
Hi,
The scanner is to show you the upgrade options and product numbers :)
8GB RAM Memory for Dell Inspiron 15 (3521) (DDR3-12800) - Laptop Memory Upgrade at Amazon.com
Seems to be the same as this RAM at Amazon. Looks like it has decent reviews there, but I know nothing about "Offtek". If you cannot get commonly known brands, it's probably worth a try. It will either be fully recognized and "work" or not. If it won't, you have to be able to return it. There's some risk involved, but there always is when dealing with an unknown brand or vendor.
It will work.
1600 x 8 = 12800 so the link you posted is for DDR3 1600 or PC 12800.
They offer free shipping inside US. For other country they will charge you the US$40