I saw Z390 Taichi got L4.21 BIOS update that improve the DRAM OC compatibility with Hynix IC.
https://www.asrock.com/MB/Intel/Z390%20Taichi/index.asp#BIOS
Any plan to bring this to Z370 Taichi ?
I have Hynix OEM 2133Mhz RAM (dual ranks AFR) and it can OC to 3500Mhz 16-18-18-38-360-2T 1.38V
Something that I curious is about memory slot. As I said before My OEM Hynix can hit 3500 16-18-18-38 24/7 stable. But both stick when populate to slot A2 can hit 3800Mhz at the same timings. One stick is even boot at 3866 !!!
But when I try both on B2 they never exceed 3500 unless I relax primary timing to at least 19-21-21-41 (19-22 19-23 19-25 etc work also). But that doesn't make it stable. Best I can get is 3733 19-21-21-41 but got error with just Super PI run. Never mind memtest.
So slot B2 is weaker than A2 by 300Mhz with dual ranks Hynix AFR. Quiet huge.
ODT also play an important role. With auto I can only boot at 3333Mhz. With manual there are still many cold boot training drift to reach 3500Mhz.
Slot B2 @ 3800Mhz work fine with other IC such as single rank Hynix CFR , single rank Micron E-die , single rank Samsung B-die.
Another thing that I notice is with 8700K 300K VRM frequency (default value) is fine but 9900K at maximum 600K can yield better stability.
I read somewhere on Elmor post about ASUS 500K vs 800K and 800K give better results on undershoot / overshoot.
I wish Asrock can bring back 1M frequency like Z170 OC Formula.
LLC is great for 8700K but for 9900K it drop quiet large amount of voltage (looking at VR VOUT)
I set 1.46V in BIOS but during Cinebench it drop to 1.385V.
I wish ASRock can improve LLC1 to match LV.7 ASUS and LLC2 to replace current LLC1.
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