Looking at used laptop

Andrew_420

Prominent
Apr 1, 2017
1
0
510
Looking at purchasing a used. Laptop with a 840m in it and ive seen the screen shot that says there is 6gb of available memory. My question is there an 840m made with 6gb of memory or is it possibly sharing memory if that is even possible? The laptop is and acer v3-572pg .
The price is $600cdn used. It has 8gb system memory.