Minor update while I await the replacement top for the chipset block from nateman_doo. No pictures.
Been playing with BIOS profiles for different overclock settings. When I set these up originally, I did so with 32GB of memory at stock settings (1866, 9-9-9-27). So now, I'm going back and making sure that I can overclock the memory with the CPU overclocking profiles I had setup.
4.6GHz offset -- This profile will probably be what I leave the box at for most of the time, since it's on 24/7. With a voltage offset of 0.03 and LLC of 3, this profile puts my vCore at 1.36 at full load, and drops it back down nicely to less than 1.0 volts when idling. I tweaked the memory to 2133, 10-11-10-30 and 1.57 DRAM voltage, and had no issues at all with a 12 hour Prime95 blended torture test. Temps are very nice with vCore at 1.36 and average CPU core would stay right around 59 or so. Also, I saw no appreciable increase in the memory temperatures by bumping the DRAM voltage to 1.57. I'm still running with no water on the memory blocks right now, but plan to plumb these back up during next update. Water lowers the memory temps by more than 10 degrees.
4.7Ghz offset -- This is the highest overclock I have been able to achieve stability with (24 hours of Prime95) an offset voltage instead of fixed voltage. With offset, it requires 0.1 positive offset, and this produces a vCore of 1.43 at full load. This is way more vCore than it needs for 4.7Ghz, but this processor/board requires more voltage when using an offset profile for when it downclocks. I don't like this profile, and won't be doing much with it.
4.8Ghz fixed -- Hitting 4.8Ghz with fixed (or manual) voltage was easy for this processor/board. Rock solid stable at 24 hours of Prime 95. If I set the fixed voltage to 1.38 with an LLC of 1, this produces vCore of 1.40 at full load. Temps are still very good at 1.40 vCore, so I like this profile. But....since it is fixed voltage instead of offset, it doesn't decrease voltage as CPU downclocks. So even when idling, the vCore remains at about 1.39. So even though temps are great when idling, I don't like leaving that much voltage running 24/7. So I'll probably use the 4.6Ghz offset profile the majority of the time, but load this profile when I'm going to be doing some heavy lifting for an extended period. The bump in memory speed up to 2133, 10-11-10-30 required a little tweaking for stability. I hit a few issues during Prime95 with DRAM voltage at 1.57, but reached stability by increasing DRAM voltage to 1.59. No significant change in memory temps by doing this.
5.0Ghz fixed -- Booting up is a little tricky at 5.0Ghz, and I'm successful about 75% of the time. However, I've found that if I boot at 4.9Ghz, I can always boot, and then I use the Asrock Extreme Tuning Utility tool to increase frequency to 5.0Ghz and fixed voltage to 1.42. At an LLC of 1, this produces a vCore at load of about 1.44. Prime95 can produce some errors when run for extended periods, but I seem to be able to run any of the benchmark programs I have without issue. So....I'll probably run a set of epeen benchmarks at 5.0Ghz, but keep the machine at a different profile for most of of the time. Memory was able to stay at 2133, 10-11-10-30 and DRAM of 1.59 for these runs.
Other than waiting on nateman_doo replacement top for chipset block......I'm going to continue with some memory tests. I'm going to put back in 64GB instead of 32GB...and see if I can still use the same CPU overclocking profiles I setup. Once I know this....I'll decide on final memory configuration. 64GB vs 32GB......and what speed/timing to run it at.