[Q] Should i buy Mate 7 version 2gb ram or 3gb ram topic

HI everyone,

I've just save enough money to buy Mate 7 but now i can't decide what version i should get.
What is the difference of 2gb ram and 3gb ram on Mate 7. How many free ram we can get on mate 7 2Gb ram.
Really need your help cause the price for Mate 7 3Gb ram is too expensive for me
Sorry for my bad English.