AMD Ryzen 7 3800X pushed to 5.9 GHz along with DDR4 RAM at 5,774 MHz on LN2, seems to have good potential for an all-core overclock record - NotebookCheck.net News
Improvements to the Cache Hierarchy: Lower Latency = Higher IPC - The AMD 2nd Gen Ryzen Deep Dive: The 2700X, 2700, 2600X, and 2600 Tested
RAM speed on Ryzen 7 2700x - CPUs, Motherboards, and Memory - Linus Tech Tips