Editing native multi-stream 4k & 6k video tracks with Premiere....Grrrrr!~

Oh Premiere... or is it my new PC?

I just purchased this beast (see specs below) hoping that it would crush through playback/editing multiple streams of 4k and 6k video footage. Unfortunately it can't manage the native footage even at 1/8 resolution. We have been using the new iMacPro which can manage this task (albeit not full res) just fine. I was hoping by switching to a powerful PC that it wouldn't blink at performing this same task without having to drop the resolution.

Any suggestions on what I can do to take advantage of this new pc and premiere?

Thanks!

Intel Core i7-7820X Skylake-X 3.6GHz (4.3Ghz Turbo)

Eight-Core |

Noctua NH-U12S 120mm Fan Quiet |

ASUS TUF X299 MARK 2 (Intel X299, 4xPCIe, 6xSATA, 2x

M.2, 8xDDR4) |

64GB (16GBx4) DDR4 2400Mhz Memory Lifetime Warranty

(Major Brand) |

512GB SAMSUNG 960 Pro Series PCIe M.2 |

512GB SAMSUNG 960 Pro Series PCIe M.2 |

11GB GTX 1080 Ti GDDR5 Video Card |

Microsoft Windows 10 Professional 64bit (Includes DVD +

COA) |

Fractal Design Define C Tempered Glass (2 3.5, 3 2.5) 2 Fans,

Audio/USB 3.0 |

850watt eVGA G3 Gold 80 PLUS CERTIFIED |

Onboard 1Gbit LAN included |

Onboard HD 7.1 Sound included |

[Moderator note: moved to best forum.]