Quote Originally Posted by CryptiK View Post
Thankyou, that's interesting. I have at least preliminarily corrected the issue by increasing Vtt to 1.35625v in BIOS, which according to everest is 1.296v under load, and as per your findings this is higher than the real Vtt. I will have to measure at one of the MLCC's as you suggested to see what my board does. I did that with my R2E (I have a TJ07 so the socket area is cut out making access easy) and made a table of BIOS vs Software vs Real voltages.

Thing is I thought I'd sorted it last night by upping it to 1.350Vtt BIOS but this morning it hung on DRAM again on cold boot after PSU power off.

Did you investigate what enabling Vtt LLC did to the voltage? I don't usually run any LLC as I want to avoid transient overshoot conditions. However if it corrected the sag a little but still allowed some droop under load I'd be temped to use it.


I didn't get time to investigate the LLC option, unfortunately.

One thing I would do is check what the board is defaulting the RTL settings to, if they are too tight some of the symptoms you mention would manifest. Hunting something like this down can be like shooting in the dark, though.