Are you editing HD only or also looking to edit 4k? I have just upgraded to a Ryzen 1800x in order to edit smoothly in 4k. This would however be totally overkill for HD. My last machine was a Sandybridge I7 2600k, p8z77-v deluxe, DDR3 and HD6990 and it managed HD footage with ease. However, i started editing in 4k recently and on the old machine it was eye popingly frustrating with slow scrubbing, lots of crashes and encoding would need to be done over night. The new Ryzen beast cuts through 4k like butter!
What resolution are you editing and what software are you using to edit?