Can't get my memory to run @ 3600mhz?

oops · 7 Jan 2022 at 20:07

Hi all, I'm a bit of a rookie at this so please be easy on me
I have a ROG Maximus XII Hero mobo and I installed the Vengeance RGB Pro DDR4 PC4-25600C18 (2x16gb @3600mhz)
I have went into my Bios and set the XMP profile 1 but the best I can get the memory to run at is 3000mhz even if I set the XMP to profile 2 I still cant get better than 3000mhz, If I do set the memory higher I get the crash screen.
Do I need to change something else?

Thanks.

uksoldierboy · 8 Jan 2022 at 03:25

Try using xmp 1 and adding a little more voltage, under Dram voltage, try 1.4v, see if its stable with that.

Is the cpu overclocked at all?

oops · 8 Jan 2022 at 05:29

@uksoldierboy thanks for the reply m8, but when I try to adjust the Dram voltage to 1.4v and save and reboot the voltage reverts back to 1.35000
I have tried the pre-sets but then when it re-boots the Q-code is reading 55 which on this motherboard means memory not installed, I have the ram in Dims 1 & 3 which is what the user guide for the mobo recommends.
Yes I bought the PC its an Intel® Core™ i9-10900K 10 Core (3.7GHz @ up to 5.1GHz)

freddie64 · 8 Jan 2022 at 09:37

oops said:
I have the ram in Dims 1 & 3 which is what the user guide for the mobo recommends.

If i am looking at the correct motherboard manual, it recommends using slots A2 + B2 (that will be slots 2 and 4).

Not had to do this myself but have read that entering the RAM timings Volts manualy instead of using XMP can work.

Good luck.

uksoldierboy · 8 Jan 2022 at 10:36

If you can, save the current profile in the bios, then load optimised defaults, try enabling xmp, maybe there's been a change that need to go back to default.
Double check that the ram is in the correct dimms for dual channel, update the bios to the latest version if you haven't already too.

oops · 8 Jan 2022 at 14:54

@uksoldierboy & @freddie64 thanks guys I did exactually what you recommended I re-seated the ram in dim slots 2 & 4 and loaded the optimised defaults then re-enabled the XMP1 and hey presto it's now running at 3600mhz.
Thank you so much for your help.

EsaT · 8 Jan 2022 at 15:15

In most motherboards DIMM should be always in farthest slot of the channel from CPU.
If DIMM is in slot in middle of wiring, that end of wiring "hanging in the air" causes signal reflections distorting all signals.

That's also why old coax ethernet needed that termination resistor (just called as terminator) in ends of the main cable.

uksoldierboy · 8 Jan 2022 at 17:41

oops said:
@uksoldierboy & @freddie64 thanks guys I did exactually what you recommended I re-seated the ram in dim slots 2 & 4 and loaded the optimised defaults then re-enabled the XMP1 and hey presto it's now running at 3600mhz.
Thank you so much for your help.

Happy to help bud! Glad it's all sorted