Safe VCCSA and VCCIO for DDR4

[emil2424]

hi

My PC
Intel Core i7 6700K + Thermalright Macho Rev. B
Asrock Fatal1ty Z170 Gaming K4
Zotac GeForce GTX 1080 AMP! Extreme
G.Skill TridentZ DDR4 XMP 3200 MHz 2x 8GB (F4-3200C16D-16GTZ)
GoodRAM Iridium Pro 240 GB
WD Red 2TB
EVGA 750W SuperNOVA G2
Asus Rog Swift PG348Q (3440x1440)
Nzxt H440
Windows 10 Pro x64

With the started XMP profile (16-16-16 -35-2 N 1.35 V) the PC isn't being started. I tried to lower the frequency and to change voltages (1.25-1.4). But only what helped it is a VCCSA change 1.050 - > 1.07 and VCCIO 0.95 - > 1.02 but not yet I carried of more serious tests of the stability.

My question is following: what VCCSA values and VCCIO are safe for DDR4 and the Skylake platform

[emissary42]

Most people would consider both values to be on the safe side and if that is what your CPU needs for DDR4-3200, then so be it. Most boards with raise those voltages if left on auto a lot higher than that up to a point where the MB manufacturers needed to implement a patch to keep iGFX functionality (my ASUS M8G initially had issues with HDMI blinking because of VCCSA/IO overkill auto voltages as well).