Silent Scone@ROG wrote:
1) Yes, this isn't uncommon. AIDA64 stresses multiple subsystems, not just memory.
2) Per core usage or using AI OC is the best method on this platform. You can find all the predictions under AI Tweaker menu.
3) Under 1.5v, however Samsung does not scale very well beyond 1.45v.
Be sure to try Tweak Modes 1 and 2 when dialling in memory. You should remove XMP / Memory overclocking and retest with AIDA to verify whether the CPU OC is stable or not. Do not test FPU and CPU at the same time. Apply an AVX offset of 1 or 2 if failing FPU test.
If Memtest86 is OK, then I still think your memory is running as it should and I'm not clear why you are still trying to stabilise XMP?
If you can't get a stable CPU overclock using AIDA with v2004, then it might be related to the BIOS itself because you said it was all working fine prior to 1720. One option is to use defaults for now and simply wait until another BIOS is released.
Sorry that I can't recommend any specific settings, but one thing to remember with overclocking is that you probably won't see a huge improvement (maybe 5%) overall, so I guess you have to judge how much effort is justified. Like SilentScone said, it would be a good idea to try AIDA with memory on defaults. At least you will be able to isolate the effects of RAM and CPU settings. Maybe get each working on their own and then try them both together? Changing two things at once means that if you get instability, then it's hard to know for sure what's causing it.
Finally, just my opinion, but overclocking the CPU hard is always going to place everything under extra stress. If you have a reason to do it, then I understand, but personally I have no need for it. The 12900 is a great CPU for me even at defaults. I'm not saying that overclocking is a bad idea, but you need to invest a good amount of time to find settings that work reliably. Remember that AI overclock isn't guaranteed to work, but it's a good way to get close to peak performance and then dial back slightly if you need to.