Deleted member 215115
Use this to calculate your tRFC: https://docs.google.com/spreadsheets/d/1A7G97QOL0dNMwJZa9SYEq2RElJ5T6Hcx9WdReTsnIWw/edit#gid=0 . You should input the correct values for tRFC2 and tRFC4 too even though they are almost never used.After fixing my minor PEBKAC issue I'm currently at ~160% memtest with 0 errors after going to 2t (stepped down to 1.4V). Current settings:
View attachment 224183
Previous settings that gave errors almost immediately, which from what I can tell are identical except for the command rate:
View attachment 224184
Should I try 1T with GDM enabled instead? Is there a meaningful difference in the performance tradeoff between the two?
Also, does anyone know if ASRock B550 boards lack a software VDIMM readout? I can't find anything resembling that in HWinfo at least.
1T + GDM is sort of like a 1.5T performance-wise and is definitely better than 2T. I would stick to 1T+GDM. Since you have no uneven timings like CAS 15, GDM doesn't really affect you much if at all.
There's nothing wrong with the timings in the second screenshot except for the GDM. As I said, GDM off with dual rank memory (2x16 or 4x8) is very tricky to get stable and is ultimately not worth it. Other than that, perhaps tRDWR and tWRRD could be set to 9-3 or 9-1 to improve stability. Generally you want tRDWR to be tRCDRD/2 +1 with as little tWRRD as possible. Sometimes tWRRD 1 works, sometimes only 3 will work. tWTRL will go down to 8, tRRDL will go down to 4 and maybe the SCLs will go down to 2 but keeping the SCLs high in order to lower the primary timings is more desirable.
In my opinion, your kit can do 3800 CL14 with a bit more voltage and with the right rtt/drvstr values. Don't be afraid to set 1.6V to test things. Nothing bad will happen to your memory. You might also want to go higher on the vSOC. It's safe up to 1.2V but you have to keep VDDG IOD within 50/75/100 mV of the SOC and the CCD within 50/75/100 mV of the IOD. They sort of go together from my experience.
As far as stability testing is concerned, the best way to test is by using your PC for a while. Sure, you can run TM5 or Karhu or MemTest but ultimately you will need to check the long-term stability at some point. Attaching TM5 with the 1usmus_v3 config. Run 20 cycles of this bad boy and you should be golden if there are no errors.
Here's me being super super tight if you feel like having some fun.
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