I got a i5 4690 (non-k), in an old dell optiplex machine, I get over 100 frames in pubg on 1080p. Honestly anything past a 2nd gen i5 is perfect for the 1050ti.
http://cpu.userbenchmark.com/
Also use this to "guess-timate" performance.
Hey I have an old optiplex 7020 with an i5 4690 in it and I was wondering if I got a pci to m.2 adapter if I could use it as a boot drive. It has that same bios that all the old optiplex pcs have.
Say with these two for example,
Card: https://www.newegg.com/Product/Product.aspx?Item=9SIA4RE5AU2769&cm_re=pci_to_m.2-_-9SIA4RE5AU2769-_-Product
SSD: https://www.newegg.com/Product/Product.aspx?Item=9SIA8N27DR7537&cm_re=western_digital_green_m.2-_-1Z4-0002-00AB8-_-Product