Can't post system with 4266 Mhz RAM speed, Maximus IX Apex MB

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MeTaL_SnAkE

Prominent
Apr 18, 2017
1
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510
Hello, It seems like no matter what settings I tried with my Asus Maximus IX Apex, I'm not able to post properly with 4266 Mhz 2x8 GB G.Skill Trident Z. I have 7700K CPU @ 4.9Ghz oc. Only if I click the retry button on the MB itself - it will post. On system restarts it won't. Tried to set Viccio and VCCSA to 1.3v, DRAM voltage to 1.5 even 1.6 (which is very high but tried just for the test), Maximus tweak mode 2 and such.. Nothing helps. system will boot normally only if the ram speed is around 4088 mhz (with BCLK set around 102+). The Apex MB should be able to post properly with 4266+- Mhz. I guess there are some settings on bios that I miss and can change in order to post properly.. Help please.
 
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jonathanjamesharris

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Feb 11, 2018
5
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520


I have this setup with a GTX1080ti in a custom EK water loop.

I used “rajas” preset memory oc profile after I set it to XMP first. His profile is labeled 4133 17-18-17

I downcllcked it to 4133 and tightened up the timings over stock because at 4266 you’re onky hitting that speed if you change your base BCLK to 103.25 which for me, caused major issues with long term stability (gaming for over 3 hours) and with Ethernet throughput (would max at my ISP’s max of 350mbps then tumble down to 100-150mbps).

Using rajas profile allowed me to stay at the default 100BCLK.

I just made sure my initial FCLK was set to 1ghz, my ram set to 1.42v, my system standby voltage to 1.25-1.26, my vccio/SA within .05v of each other and they’re at 1.304/1.334 respectively.

Lastly I actually disabled the BCLK adaptive aware option, changed from the default auto. Oh and I changed my DMI voltage to 1.26xxx volts. Hope this helps.

5.1ghz/4.8ghz uncore with 0 negative avx offset.


Cheers
 
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