Just bought an AMD Ryzen 1700 CPU @ 3000mhz and a cheap msi am4 mobo + 32gig ddr4. It's the new way cheap 8 core chip and it edits 4k like a charm no more stutters, super smooth. My old i5 was terrible. Anyway if you haven't heard look up the Ryzen CPU's they're a bargain 8 Core (16 threads) and a no brainer esp. for editing needing to upgrade. Even with an 8gig 1070 videocard my i5 2500k didn't like 4k at all. btw I bought the Ryzen 1700 because it's the cheaper cpu and it overclocks easily to