Having a pair of matching RAM sticks allows them to operate in "dual-channel" mode, which improves performance of the CPU a bit. Usually it shouldn't make a huge different with that CPU though, and with a graphics card of that performance level, I would expect the graphics card to be limiting performance more than the CPU in most games.
As far as the system's overall specs go, the CPU is fine, though the graphics card seems a bit low-end. There's a fairly large difference between the performance of a 1050 Ti and a 1060. In general, I would expect a 1050 Ti to provide about 40% lower performance than a 1060 6GB, or around 33% lower performance than a 1060 3GB. A 1060-level card would be pretty good for running most recent games at 60fps with high settings at 1080p resolution, though with a 1050 Ti, you would need to cut back the settings or the resolution quite a bit to maintain those kinds of frame rates in the more demanding titles. Also, 8GB of RAM is a bit low for a gaming system in 2019, and while most games will still run pretty well on 8GB, I would ideally want 16GB if buying a system this year, as games will undoubtedly demand more in the future. You could always install more RAM later though.
I can't say whether the pricing of that system is alright, since I don't know how the prices of new components and systems compare in your region, but if you are willing to spend up to around US $1000 you could likely do quite a bit better. Typically, the graphics card makes the most difference to game performance, so you don't want to cheap out too much on that component. An Nvidia GTX 1060 or AMD RX 580 would be about the minimum I would consider worth looking at for a 1080p gaming system currently, and you could likely do even better than that within a $1000 budget.