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Question about "Worst case scenario" in CPU settings

Level 7

I've been fighting with my ROG Z-790-H since getting it about 2 months ago.....First I picked the "wrong" memory---DDR5-6400 & had problems with stability. I think that I've got that worked out, but up till last night I was still getting random crashes when I put a load on the system.  Well, I was changing the CPU settings & tried "Intel default" which wouldn't even goto I tried "Worst case scenario" and now I can load the system without a crash (so far) Running a i7-13700KF---almost everything set at default settings (except for memory voltage increases to stabilize)

I'm at a loss---ideas please????


Super Moderator

SVID Behaviour adjusts the AC loadline to manipulate the CPU VID. Worst Case scenario is as described, the worst case deemed by ASUS for necessary voltage for stability. Check the CPU SP score as this is derived from the CPUs individual VID table, the score will likely be on the low side.

What are you testing memory stability with?


13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

I use Memtest to look at stability...   With settings:

VVD  = 1.40   VVDQ = 1.40   CPU System Agent = 1.25   IVR VDDQ = 1.40  &  Memory Controller = 1.30

I can run Memtest 86+ for several cycles without a problem.

If you have any other suggestions...I an VERY open to trying them.   I run Arch Linux 99% of the time...I do have a copy of Win 10 to boot into if I need it for some reason.


The memory in question is G-Skill DDR5-6400 Z5  2 16G sticks.

Check out Karhu RAM Test, or TM5. Memtest86+ is good for testing a base line or checking for DIMM faults, however it's not the most stringent of tests once in the OS. May help you pin point whether the system really needs to be set to an aggressive AC LL

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

Thank You for the info.......Any other ideas?

Other than adequately testing memory stability? Not as of yet, need to ascertain if you're stable 👍

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090

What do you think about OCCT?  I ran it for an hour yesterday afternoon & it reports that the memory is stable.  I'm not seeing how to get  Karhu RAM test without buying a license....

I just found a good link for TM5 & downloaded it....I need to add that when I went to the CPU test in OCCT...about 10 min into the test the system crashed.