Playing some Decently newer Games @ 1080P @ Peak Performance Demanding Times
GTX 1070TI 52 fps
GTX 1080 57 fps
GTX 1080TI 65 FPS
If your looking for higher FPS , or maybe 2K / 4K Gaming ect - Or maybe even some recording/streaming at 1080P
You'll need a new
CPU / Motherboard / Ram
Newer RTX graphics card
new power supply
SSD's are salvageable
HHD : I wouldn't use it, unless you get an adapter/mount to make it external for pictures/ Documents / older-videos.