1 GB will also be needed to achieve the Minecraft 2 rec specs and get 60FPS. To be able to run at all you will need at least 500 MB system memory. Make sure your GPU can run DirectX 9 or Minecraft 2 won’t run.
What's your user review score for Minecraft 2?
How well optimised is Minecraft 2 for PC?
Minecraft 2 is excellently optimized