For gaming ghost recon / gta v/ fortnite/need for speed2015/watch dogs 2 /and like this gamesWhat are you using this for.
If gaming, what games?
Monitor resolution and refresh?
My pc is not very goot but i will get bottleneck if i get the 1030 low profile or not?Very few of those games are going to run well on a Core 2 duo, regardless of your GPU.
I would try to upgrade to a Core 2 Quad Q6600 and GT1030 to play those games even semi decently.
What motherboard do you have?