[SOLVED] Old Optiplex or new 3300x?

[NinjaChemist]

Looking to build a gaming pc on the cheap now (May 2020, amid human malware price inflation). I found a good optiplex system (i7-4790, 16GB RAM), and these are really inflated now; cheapest is around $300. I already bought a used gtx1070, and wondering if a mostly new 3300x build might be the better option. I have a decent system priced close to the $300 mark, w/o including an OS.
I'm not a value PC shopper, and kinda worried this will balloon out of control. My wife really got into Fortnite and I'm tired of her screaming at her laptop. I'll build her a decent set-up but wanted to wait for the new releases later this year. Are the old Optiplexes still a deal or would a fresh budget build be better?
I have some parts already on-hand: a decent 600W psu, 500GB SSD, 250GB NVMe.

 

[Mooons]

Go with the 3300x build.

You'll be better off now and in the future. The 4790 is old and only supports DDR3. You'll be much happier with the Ryzen build.