asus rog maximus vii ranger

Hello everyone, I want to speed up my older system but I'm in an annoying situation, its still on a HDD. The system itself isn't that bad and it works okay but since it's a 5 years old system it isn't that fast. Delidded I7 4790k OCed at 4.6GHZ 16 GB of RAM (might aswell give it another 16GB if...