In order to gain some stability with the new bios 2601 I had to tune some parameters and perform several tests.
As expected, compared to older bios versions, it seems that for 2601 I had to increase some voltages, for instance VCORE from 1.30V to 1.32V, even VRAM from default 1.40 XMP to 1.42 V.
The IO and SA voltages are a no go if left default - which would mean 1.40V for IO and 1.5V for SA - that's the way Asus is estimating them from a long, long time for some reason.
So after several iterations 1.28 V IO and 1.36 V SA seem stable for Anta's new profile for TestMem5 and GSAT as well.
MRC Fast Boot & MCH full check on Auto this time.
Before I kept Fast Boot disabled and the Full Check Enabled. I noticed during time that keeping those as stated RAM stability was NOT consistent, it's like after every reboot different settings were loaded, training them every time seems to change some RAM parameters for some reason.
1.36V for SA seems to be enough as well for 1GHz FCLK Frequency - yeah, some say it's a fad, I know it doesn't bring too much but in some games there is some marginal performance increase.
The 2x16 4000C16 kit (F4-4000C16D-32GTRSA) seems finally stable on 2601 =))