I don't see it cheaper today and here's the difference from your 710.
http://gpu.userbenchmark.com/Compare/Nvidia-GTX-1050-Ti-vs-Nvidia-GeForce-GT-710/3649vsm77649
This will push the graphics up by about 10x.
I'd do this first then later get a second stick of RAM. Be sure it's the same model as the first stick.

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