ROG STRIX Z690E GAMING WIFI aint working with 2 kits of RAM

[Twarek]

Hello guys. Spent a few hours trying to make it work, but still no luck.
I have z690E motherboard, 12900k and 2 kits of RAM

2x16gb Kingston KF556C36BBEAK2-32 — FURY Beast RGB EXPO Black 32 GB DDR5 5600 MHz 288-pin DIMM CL36 1.25V
2x32gb Kingston KF556C36BBEAK2-64 — FURY Beast RGB EXPO Black 64 GB DDR5 5600 MHz 288-pin DIMM CL36 1.25V

If i use 2 of 16gb - all works fine
If i use 2 of 32gb - all works fine

If i use all 4 together - i receive 55 post code and nothing works.

I did try to set different XMP profiles and did try to lower from 5600 to 4800 and even to 2600 but nothing works.

I have newest update of bios.

Maybe someone here knows how to make them work together? When i bought new kit i was specially looking for same brand, mhz and timings as i thought all of them will work together with no problem on this motherboard.

Thanks.

[Silent_Scone]

Hi @Twarek 

You'll need to decide which kit you want to opt for. Combining / mixing memory kits isn't supported by motherboard or memory vendors. 

Read here for more information

[Twarek]

@Silent_Scone 

Sadge.

I thought if i will buy a ram kit from same vendor with same cl and same mhz they all will work together with no problem =\

[Silent_Scone]

Unfortunately, no. Kits are binned by the memory vendor in the density in which they are sold, they do not accommodate for combining mixed or matched kits. Tuning two memory kits requires a fairly deep level of understanding of DRA,M and there's only so much guidance one can give, if any, in some circumstances.

If needing to ask, my advice is always to purchase a single kit present on the motherboard's Memory QVL.

[Twarek]

2x32 is the max kit i can find by the link you did send.

So there is no way to use more than 64gb on this motherboard?

[Silent_Scone]

The 12th Gen CPUs generally have a weaker memory controller. Is there a particular kit you had in mind?

[Twarek]

@Silent_Scone 

I did try to insert 1x16 gb and 1x32 gb and it worked.

Then i did try to insert 2x32 and 1x16 and i successfully enter the bios which showed like 80gb+ or smth of ram. But when i did turn off a cpu fan monitoring (as i have water cooling and bios didnt proceed boot because showed this warning) and did reset, again i received 55 post code.

What this behaviour of my pc is talking about?

Excuse me if my questions are noobie, as i really barely understand what's happening.

[Silent_Scone]

You need to a singular kit. Mixing different dies can cause complications, even when not overclocked.