3.2gb Out Of 4.0gb 16.04

I hope I'm putting this on the right website. I'm not completely use to terminal commands, so sorry if I put the wrong ones.

I upgraded from 2gb to 4gb DDR2 RAM. In bios, it shows up with the full 4096 (4gb), but in Ubuntu 16.04 it only sees 3.2gb.

Output of free -m:

free -m total used free shared buff/cache available
Mem: 3249 908 1259 164 1081 1996
Swap: 3315 0 3315

In the lshw command under the memory part, it shows:

 *-memory description: System memory physical id: 0 size: 3249MiB

Thanks for the help. :)