Alright, I'm having trouble fitting that kind of performance into $850. As in, it can't be done. So, here is as close as I can get within budget.
PCPartPicker Part List
CPU: AMD Ryzen 5 2600 3.4 GHz 6-Core Processor ($124.99 @ B&H)
Motherboard: Gigabyte B450 AORUS PRO WIFI (rev. 1.0) ATX...