Hello all, starting a 8200 profile with my 2×24 gskill mdie kit. Have secondaries pretty dialed in and working on tertiaries currently. From my research and limited knowledge twr doesn't exist on intel as a timing and is instead calculated using twrpre and twrpden. My current configuration with xmp primaries, tuned secondaries, and tuned tertiaries aside from twrpre and twrpden will pass all stability tests, y cruncher, tm5 new anta ddr5 profile, occt etc. However I've been told twrpre should be able to go to high 40s / low 50s on 24gb mdie. At xmp twrpre is 83 and twrpden is at 84 and this makes twr 51. This passes the above tests many times over. However as soon as I lower twrpre and twrpden and by extension twr it will have mid cycle errors. Even up to 56 twrpre setting twr to 32. My question is does twrpre scale with voltage as I have not touched dram voltages yet aside from xmp (1.35 for both vdd and vddq) I have touched imc, cpu vddq, and sa while validating 8200 was even stable with my imc. Or is this just a limitation of my silicon lottery and my kit/imc will not handle lower twrpre. BTW I'm on a 13900ks, og apex board and gskill 48gb 8000 xmp kit. Dimms are cooled with a 140mm fan at max rpm during testing and peak at 49.6C at current settings.Thanks in advance everyone!
1 Comment
Try to leave tWRPRE and tWRPDEN on Auto and manually adjust tWR down instead. As you mentioned, tWR isn’t an actual Intel timing register. Instead, setting tWR will set tWPRE=tWR+tCWL+6.
It’s also entirely possible you just can’t get TWRPRE down lower.