- Nov 27, 2016
calculate 1600x with a noctua d15That cooler has a delta-T of ~50C at 150W coming from an i7 920 D0 @ 4.2GHz. That die is 263mm^2, so has an easier time transferring heat than Ryzen will at its measely ~192mm^2.
So, given that 8-core Ryzen uses ~65W at 3.4Ghz (CPU-only) and ~150W at 4.4Ghz, has a likely safe temperature limit around 80C, and 37% less surface area for transferring heat, I suspect you will find yourself running about ~75C at 4.1GHz on 8-cores with that heatsink. Accounting for the added power draw for the higher temperature, you will likely "creep" upward from about ~72C a few degrees, which is how I come to ~75C.
A Noctua NH-D15, from my math, based on theory and very little real world data (so a few salt mines are needed to satiate the requirements here - as with the above), will allow about 4.25Ghz at the same temperature. Be mindful: these are equilibrium temperatures with assumed wattage outputs... lots of assumptions, in fact, such as 22C ambient temperatures (my house temps).
Standard water-cooling, however, should be able to keep the case(IHS) temperature low enough to keep the delta at the die-IHS interface high, which increases thermal efficiency, which reduces power needs, and allows for better results. The actual amount of heat is, by no means, a problem. It's getting the heat out of the die through its small interface with the IHS that is problematic.
A heatsink with a larger thermal mass will take longer to reach equilibrium temps, so you could probably run 4.4Ghz with gaming loads, if the CPU can handle it. Overclocking should improve with BIOS updates, so keep up to date