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I just loaded 2004 beta onto BIOS 2, seems to be working fine.

Haven't loaded all my old settings yet or ran any benchmarks, as I wanted to Enable Resizable BAR than check Windows Device Manager...

I updated to 2002 this morning, I haven't noticed any issues. The 2002 update is solid on Extreme board.

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Last year they talked about a Maximus Z490 XII Glacial being in the works, and a few sites reported that a Z490 Glacial was coming, but Asus apparently dropped the board completely from it's lineup....

I just started working on 4400MHz this morning. I set DRAM @ 1.45V and VCCIO/SA @ 1.3V and this is first boot with everything in Auto.

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Going to start adjusting, tighten things up, run...

I do not use MemTweakit. However last I heard it does work on Z490 boards, you can try this version. https://www.dropbox.com/s/x6hy0hrsgu...dk151.zip?dl=0

Currently I'm running 2x16GB memory kit,...

For RTL/IO training my system works best with Maximus Tweak in Auto, than I go into RTL IOL Control, insure all RTL & IOL are in Auto, than scroll down to IO Latency Offset,.. and raise the value by...

Back in May 2020 ITIGIC did a list of all compatible models of Z490 boards with PCIe 4.0,.. and Asus offers support for 15 of it's Z490 motherboards with the Maximus XII Extreme model confirmed to...

I have been following the Guide you posted 12-16-2020 11:23 PM post #422 on this thread.

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The Guide lists tRFC & tREFI as third step, with Primary Timings being second step ?

I am...

@n1kobg, my memory voltage is 1.45V, is shown as DRAM on HWiNFO64 Sensor Status above CPU VCCIO.

Thanks for the advice.

This 4200MHz profile is going to be my 24/7 settings, going for the...

The only timings I have adjusted/set in above post are the Primary's, tREFI, and I'm working on tRFC, will be between 378 - 294 when I'm finished testing.

All other timings Secondary, and Tertiary...

So far everything is stable, running 16-16-16-36 CR2. Going to play around with tRFC, run some more tests.

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I bumped VCCIO/SA up to 1.25V, running Prime95 now for a few hours,..
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The 2x16GB modules PCB is B1 8-Layer, 2-Ranks, they are Samsung B-Die.

They booted Windows just fine @ 4200MHz in Auto settings with DRAM 1.45V and 1.2V SA/IO, timings are loose but stable.
...

Hope so, will be disappointed if not. My kit is out for delivery now, should have it by noon today.

I'm running a temp cooling solution that interferes with first DIMM slot, so could not test...

I should have my kit tomorrow, ordered from the egg a few days ago, with express shipping.

Running 2x16GB with unused slots DIMMO A, B both disabled in BIOS should help stability at higher...

I generally run in default settings with memory @ 3600MHz tuned instead of using XMP.

Time Spy run @ 4200MHz. http://www.3dmark.com/spy/16964375

You will enjoy tuning your memory and checking...

This board will take any value I put in on any timing and not crash at re-start, it will boot Windows every time, or go to F1,.. it's crazy.

Lowering tRFC from 367 only reduces Read/Write/Copy &...

BIOS 1003 is solid on Maximus Extreme XII board.

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Loading my old 5.3 all core profile and running Prime95 now,..

I was having same issue with lowering RTL/IO. In Auto my values were 69/69/15/14 and I tried 7/7, 6/7, 14/14,... nothing worked, mem training was listing crazy values that would not boot. I was able...

I swapped out the G.SKILL 3600C14 A1 PCB modules yesterday, and testing a Corsair 2x8GB kit.

Still have a bit of work to do.
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Thanks again for the advice.

Everything went together smoothly after starting from default settings, and following the proper steps as to which timings to adjust, and in correct order. Does take...

Thanks Morph, I'm on it. I enjoy reading.

Edit :
After reading that link above, and the DDR4 guide by HISEVILNESS,.. I now have a much better approach, understanding for adjusting all timings.
...

I adjusted tRAS from 37 down to 35, and dropped Command Rate to CR1,.. and got some strange results, Read went up nicely, but Write & Copy took a huge hit dropping,.. Latency also dropped to sub 40...

Thanks, done deal.

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Read, Write, and Copy are still going up, and Latency is basically the same, perhaps .8 ns lower.

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RTL (CHA) D0 74
D1 69
RTL (CHB) D0 74
D1 71
IO-L (CHA) D0 4
D1 14
IO-L (CHB) D0 4
D1 15

Any suggestions or advice would...

Was hoping someone would answer that for you, as currently I have tRFC 2 & 4 set to Auto, along with the Third Timings.

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I put the 3733 profile on the back burner, started working on a...