>>340727097
You're at the minimum specs for VR right now. Your first priority should be a GPU with a decent amount of VRAM, 8GB or more, and then an upgrade to a newer CPU with more memory bandwidth.
I had a similar setup, an i7 2600 with a 1080ti, when I first started playing. The 1080ti was fine, and I'm still using it now, but my framerate in most VR games doubled or tripled after moving to a Ryzen 5 5600x-based system.

Supersampling will improve clarity if you have GPU power to spare, though there are diminishing returns once you're more than 2x-3x your headset's native resolution. You don't have the extra power, though.