ROG Maximus XII Hero Wifi unable to XMP Patriot Viper Steel 4400mhz

sd_dracula · 13 Dec 2020 at 12:35

I have a ROG Maximus XII Hero wifi paired with an i9 10850k and 4 sticks of Patriot Memory Viper Steel Series DDR4 16GB (2 x 8GB) 4400MHz Performance Memory Kit - PVS416G440C9K
It detects two xmp1 and two xmp2 profiles (4400 and 4295) and when I try each of them it won't post.
I can only get it to work ok on Auto @ 2133 which is pretty pointless imo
I assume 4400 and 4300 is not possible (should have got the 4000 I guess) so anyone know what the sweet spot is for this board/RAM combo?
Bios version is latest 1002.
I have tried selecting the 4300 xmp profile and then setting it to 4133 or 4000 and it boots ok however it makes all games CTD after a few mins so it's obviously not working right.
There is also a samsung memory profile for 4000mhz and 4x8gb sticks in the bios but that also ends up in a quick CTD.
Anyone know how to get these to run stable at 4000mhz at least?

BallistixOnZ490 · 15 Dec 2020 at 15:02

The sweet spot is 2x16 Modules and never use 4 modules for ocing.

2x8 Gb sticks are only rated for when two sticks are used. 4 sticks rarely if ever pull of high frequencies.

Ram overclocks are limited by both the motherboard and IMC on the CPU, not by the ram. In most cases high end ram is specified too high for what most CPU / Mobo combinations can handle.

Joxeon · 15 Dec 2020 at 15:08

Yeah 4 modules at that speed is a big ask, I'm guessing if you just run 2 it will boot fine at 4400? If so atleast you can run memtest on each pair at a time @4400 just to make sure one is not defective.

BallistixOnZ490 · 15 Dec 2020 at 15:10

The best I've seen for 4+ modules is Linus getting 8x16 Gb sticks stable at 3600 CL14 in his maximum cost build. 4000+ is two sticks only territory.

Also on higher end platforms, quad channel gives exactly 0% boost to gaming though for whatever reason. 2 sticks at higher frequencies works better although gains after 3600 CL14 are minuscule.

I wish more mobo manufacturers made 2 slots only boards, the only such full size one is from Asus and costs £450 (For Intel at least). The mini itx boards work exceptionally well for ram overclocking though, usually except for Gigabyte ones who still use T topology on their mini itx boards.