Trident Z RGB F4-4266C19D-16GTZR on Aorus Z370 Ultra Gaming 2.0

[Azya]

Hi. I have ddr4-4266 ram kit (2x8 GB). System doesn't start with XMP profile. I tried to up VCCIO/SA to 1.45 V, not help. It started only with 3600 MHz@16-16-16-Auto 1.35 V. When make 16-16-16-36/39 system is not stable.

Configuration
i7-8086K @ 5.1 GHz 1.29 V
2 x 8 GB F4-4266C19D-16GTZR
Aorus Z370 Ultra Gaming 2.0

Help please to make it work on 4000/4133/4266 MHz.

[GSKILL TECH]

Those results are right on par with what we have experienced as well:

https://www.gskill.com/en/configurat...094&model=3109

BIOS update may be necessary to support higher.

[Azya]

I have updated to last bios version and ram still fail in memtest on 3600 @16-16-16-36. New test on 3400 is in progress. No fails in 3 hours of test. How to calculate sub timings?