Z370 Extreme4 XMP bug

For some reason it won't let me edit that last post.

But I'm happy to say this is a reply coming from the PC in question.

I ran Prime95 for a while and got sick of the fans turning on, so I'm kind of happy with that.

Without changing anything from default, all I've done so far is:

XMP -> Profile 1 (BIOS 4.10)
CAS Latencies are 16, 18 and 38 respectively.
RAM target speed was set to DDR4-3200 (which sets CPU at 5.0GHz)
IO voltage was tweaked down to 1.050 and SA to 1.150 volts respectively.

Curiously, the BIOS update seems to use Intel's ME (Management Engine) differently, and now protects Ring 0 from a kernel driver access resulting in a BSOD (Or Lock/Freeze, whatever you like to call it) when you use the ASRock Utility and press "System Tools", CPU-Z or HWMonitor. So I guess I can no longer do that, and I removed them from my AppLocker execution policy to prevent them loading.

Also having this issue (using a z370 pro Fatality). RAM clocks at 2133mhz. I can set it to 3200 manually, but I have a lot of random freeze-ups in games and while running various applications. Default always sets it back to 2133. I also tried changing the vccio/vccsa settings, but to no avail.

CPU: i7-8700k
BIOS: 3.40
RAM: CMK16GX4M2B3200C16 (apparently I'm not the only one having issues w/ Corsair mem)

Any ideas?

techdiver wrote: Just going on my previous experience. If I enabled XMP my system would become unstable quite quickly (unless I manually adjusted VCCIO and VCCSA) but now it runs normally without any adjustment.

Yea you said that already. I've tried it with the latest BIOS and it's not running stable when I leave the fields "Auto" for VCCIO and VCCSA. My computer crashes within 1 to 2 days. Without XMP it's running rock solid.
I'm gonna let my computer run for a few days now with the lowered voltages for VCCIO and VCCSA. What makes me worry already is my Windows Hello camera because it was always a good indicator of whether my system is running stable or not. Sounds strange, right? But without XMP after I wake up my computer it goes on to check my face immediately. But when my RAM is overclocked (manually or with XMP) it takes some more seconds for it to turn on (sometimes it doesn't even turn on at all). And right now with the lowered voltages but XMP activated it still takes some time to turn on after I wake up my computer from sleep.

techdiver wrote: Now in saying that, in my system, any overclock whether it be CPU or RAM causes resume from sleep issues. This is definetly still motherboard issues.

I had issues like that with my old system but that was due to a little incompatibility of my RAM in combination with my Mainboard. Aside from that everything worked just fine.

techdiver wrote: I downloaded and tested 4.10 and it seems enabling XMP works now without any need for voltage adjustment.

I cannot confirm that. My mainboard runs BIOS 4.10 since the release date of that version and I even tried other RAM modules (both on QVL list). VCCIO and VCCSA are still very high values.

BUT I cannot tell if my system runs stable with lowered values (as mentioned before in this thread) because just now was the first time I ever changed VCCIO and VCCSA. My system never ran stable. Hopefully lowering the values fixes this now once and for all.

Hey, so apparently there is yet another BIOS update available.
Has anyone yet tested this?

V4.00