Writing the settings down is good or if you can remember them.
To set your ram manually, you'll want to reset the bios to defaults (F5 key).
Then on the Extreme Tweaker page set:
Dram Frequency - 4266MHz
Dram voltage - 1.48v
CPU VCCIO voltage - 1.28v
CPU System Agent voltage - 1.29v
Dram Timing Control:
The primary timings may show only three timings as the middle two are tied together, so you'd enter the primary timings:
Command Rate 2N
Maximus Tweak mode 2
And that's it, F10 and Enter to save and exit.
Pretty easy for setting it manually?
So my system was stable on 602 bios and a manual OC on ram to get its rated speeds and like a goof I decided to update the bios to bios 2004 and did not know once I did I could not go back to my old bios as Asus thinks its to old. Yes its a old bios but it was stable on the manual OC someone helped me with. So my manual OC I had on bios 602 is a no go as I dont know enough on manual OC and whats safe for voltage etc . Now the first bit when I tried xmp one on my ram with bios 2004 it all booted up and no issues I ran my ram test all was good until I rebooted after a 12hr ram test on Karhu RamTest and landed in BSOD land after a reboot. Turned my windows was not stable I suspect maybe I'm wrong. Now I have windows stable before I go back into bios does this bios support 4266 rated ram on XMP 1 or 2 if at all and yes this ram is in the QVL for the MB. I just don't want to muck everything up again as its been just over a week already mucking about with windows and bios.
So have they sorted it out on Bios 2004 for 4 sticks of ram to go on XMP at 4266MHz? Before I clued in my windows was maybe a issue I had better luck on XMP 1 then XMP 2. Bottom line I just want to get my ram back up to its rated speeds like I had it at. Lesson learned never update bios unless you have a problem lol.
CPU - Intel I9 - 9900K Processor
CPU Cooler - Hydro Series H150i Pro RGB 360mm Liquid CPU Cooler
Motherboard - ROG Maximus XI Extreme
RAM - DDR4 G.Skill Trident Z RGB 4266Mhz 32GB
Video Card - ROG Strix OC 2080Ti OC
Case- Corsair 780T
Power Supply - Corsair HX 1200i
SSD's - Samsung 860 evo X3 1-500GB 2-1TB
Fans - Corsair ML140 Pro 140mm
Command Pro- 1
Win 10 Enterprise 64bit
What I had for manual OC on bios 602...
passed 8hr test on Karhu RamTest
Set to Manual OC
Dram Frequency 4266MHz
Dram voltage 1.45v
CPU VCCIO Voltage 1.25v
CPU System Agent Voltage 1.29v
Dram timing control 17-18-18-38
Dram command rate set to 2N set dram current capability to 130%
Silent Scone@ROG wrote:
4266MT on Z390 can be tough. Unfortunately, BIOS updates can introduce new ME firmware which sometimes can impede overclocking. It's important to make note of any values, even if on auto.
You can try the memory subsets here from an old screenshot of mine and see if this helps improve the situation. VCCSA (System Agent) is quite sensitive on this platform when pressing on, as signal margins are quite tight. You may need to experiment again with this rail if you did not note how much voltage you were using on the previous BIOS. There's no "magic bullet" on this rail as it's CPU sample dependant, so test methodically.
Hope this helps.