Hp workstation gaming laptop 12gb ram it has two slots

Hp zbook workstation big machine 17inches 3hrs plus battery 4gb dedicated Nvidia graphics card core i7 5th gen 2.80 speed clock 4 cores 500gb hdd plus 1 empty slots for hdd and 1 for SSD total it's 3 slots for storage give me k4000 or swaps plus top up allowed mtendere