Vostro 470, Ram, GPU upgrades?

hello guy 

i want to upgrade my old desktop VOSTRO 470

ram 4 G VGA Nvidia 660 GTX  

for playing monster hunter world 

Here are the Monster Hunter: World system requirements (minimum)

• CPU: Intel Core i5-4460, 3.20GHz or AMD FX-6300
• CPU SPEED: Info
• RAM: 8 GB
• OS: WINDOWS 7, 8, 8.1, 10 (64-bit required)
• VIDEO CARD: NVIDIA GeForce GTX 760 or AMD Radeon R7 260x (VRAM 2GB)
• FREE DISK SPACE: 20 GB

or buy new one??