I’m still rocking my haswell refresh system I built in late 2013.
I’m selling an RX580 if you want a GPU upgrade. Check my sales thread :3 180 barely really stressed.
Assuming you’d reuse the case, PSU, and GPU, you could get a CPU, RAM, Mobo and SSD. Plenty of decent options and things are pretty cheap
https://pcpartpicker.com/list/wkkMr6 - $341 US
Are you sure about not being able to OC?
MSI A68H-E33 allowed me to OC the heck out of my 7850k
dual gfx setup and no L3 meant a lot of heat for 1 lousy fps, but it was still funs to see how hard I could push it
I like the cheap 1tb spinning rust option