Question Need help with the value of this computer

That's a pretty beefy machine. It's a bit held back by the RX 580 GPU to be a top-tier gaming rig. But with 96GB of memory this probably wasn't meant to be a gaming rig.

It's a couple generations old, and the watercooling loop probably needs to be maintained by now. But you could probably get between $2K and $3K for it. Or at least, that'd be the ballpark to build it new.