Squidyboi :
I was going to get another graphics card soon with 4gb, will this increase performance?
Well depends on the GPU. NVdiia 'gaming' cards all end in x60, x70, x80 - if you were to get say a 1020 or 1050 (not TI) then you wouldn't get much improvement though they are 4GB cards. Further if you increase your GPU demand with a better GPU card, you will have to replace out the PowerSupply to meet the new card's demands as well.
Further then the issue becomes the CPU (Amd 10 7850K). These APUs were built to be cheap, low power, low demand answers for AMD in the marketspace, not meant for gaming http://www.pcgamer.com/amd-a10-7850k-kaveri-processor-review/ . While they can' be assisted (as you have right now) with a GPU, they become the bottleneck very quickly (the reason the computer stutters and stalls) and do NOT have the 'hardware' to meet many game requirements (to perform just like I seen on Youtube Videos). Lastly the APU line has no 'upgrade path', you can't get the new Ryzen onto it, nor swap them out to Intel CPUs (i5-xxxx, etc.).
The typical gaming configuration to get "as EXPECTED" performance from current and NEW titles (example Destiny 2 which just released) starts at a i5 Gen 4 or newer and paired with a equally powerful GPU like the Nvidia 1060 or 1070. Cost? Your $700+ by the time your done, typically. Ways to shave it down, downgrade to a 1050TI (know you will have less performance but still Good performance) which saves on swapping out the PSU (Power Supply) and is cheaper then the 'gamer' 1060 or 1070; and typically very easy grabbing a current 'off the shelf' i5 based desktop at Best Buy, Walmart, etc. and just tossing in the card the same day and be gaming immediately.