Question about Optiplex 3020 ram compatibility

Hello, so, um I happen to have a rare case of owning an Optiplex 3020 that is not a Mini Tower model. It's a normal sized Desktop Tower. The stats are: i5-4590, Model is 040DDP, Chipset is Intel Haswell and I'm currently looking for a compatible 2x8gb ram upgrade. Does anyone know which ram is compatible with this model? I currently have it running with: SK Hynix 4gb DDR3 RAM PC3-12800(800MHz) and Corsair 8GBDDR3 RAM PC3-12800J(800MHz)