Question 64GB RAM installed but only 32GB usable ?

[Adilabdurahiman]

My PC has 64GB RAM and it's all detected, but PC only wants to use 32GB of of it.
Why is it so ?

 

[Fix_that_Glitch]

What is your pc build?

 

[Adilabdurahiman]

My pc has motherboard:asus prime h610m kd4
My full bios
TSUS


UEFI BIOS Utility - EZ Mode


English 2] Search(F9) TEo ReSize BAR


Thursday


Information


PRIME H610M-K D4 BIOS Ver. 2212


12th Gen Intel(R) Core(TM) 13-12100F


Speed: 4100 MHz


Memory: 32768 MB (DDR4 2133MH)


CPU Temperature


DRAM Status


DIMM_A1: Samsung 32768MB 2133MH2


DIMM_B1: Undefined 32768MB 3200MHz


5°C


CPU Core Voltage


1.128 V


Motherboard Temperature


46°C


Storage Information


АНСІ:


SATA6G_1: ST2000VX000-1CU164 (2000.3GB)


SATA6G_2: ST3000NM0033-92M178 (3000.5GB)


SATA6G_3: TSA 128GB (128.0GB)


EZ System Tuning


Click the icon to specify your preferred system settings for a power-saving system environment


Normal


Boot Priority


Choose one and drag the items.


Switch all


Windows Boot Manager (SATA6G_3: TSA


128GB) (128.0GB)


X.M.P.


Disabled


FAN Profile


CPU FAN


1530 RPM


Disabled


CPU FAN


100


%


CHA FAN


NIA


30


QFan Control


Boot Menu(F8)


Default (FS)


Save & Exit(F10) |


Advanced

 

[Adilabdurahiman]

And my gpu isnt shown its rog strix gtx 970

 

[--SID--]

DIMM_A1: Samsung 32768MB 2133MH2


DIMM_B1: Undefined 32768MB 3200MHz

What's the exact brand AND model of those sticks?

 

[SkyNetRising]

My PC has 64GB RAM and it's all detected, but PC only wants to use 32GB of of it.
Why is it so ?

Can you show screenshots from CPU-Z - memory and spd sections?
(upload to imgur.com and post link)

I'd suggest updating BIOS to latest version.

 

[JayBird99]

For one your RAM sticks are mismatched and different speeds.
Two, brand of the two sticks?
What does the BIOS see? Does the BIOS see two DIMMs?

Can we see a close pic of the undefined RAM stick of 32GB? And are you sure your board is friendly with 2133MHz memory? 2133 with 3200, the system will run dual channel if it can be recognized, but it will only run at 2133. Lowest common speed denominator.

 

[JayBird99]

Those are both matched Samsung 2133 DIMMs, which with Alder Lake… why 2133?? I am confus.

EDIT: my guess is that it’s running on the undefined 3200MHz stick. Could be wrong though. What happens when you remove the slow 2133 stick?

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www.ebay.com

 

[Adilabdurahiman]

https://imgur.com/6eEdrBO

https://imgur.com/WalX90X

https://imgur.com/a/3c71qfM

 

[Fix_that_Glitch]

You are using mismatched memory sticks. It is only using one stick because it cannot find a happy middle ground to use both.

 

[COLGeek]

I recommend reversing the sticks of memory to see if the problem "moves". Also, when doing so, make sure the memory modules/sticks are fully/firmly installed in the slots.

 

[Adilabdurahiman]

i have tried updating bios,reversing modules
still nothing has changed
is there a solution?

You are using mismatched memory sticks. It is only using one stick because it cannot find a happy middle ground to use both.

 

[COLGeek]

The memory is either defective or simply doesn't match and won't work together.

 

[Adilabdurahiman]

the modules work when inserted alone
so they dont seem defective but they dont work when i insert them together

 

[COLGeek]

Is it always the same slot that shows the memory as undefined when both are installed?

 

[Adilabdurahiman]

Is it always the same slot that shows the memory as undefined when both are installed?

btw after i swapped as you told the undefined one showed up a name

 

[COLGeek]

btw after i swapped as you told the undefined one showed up a name

Are both of these modules 100% the same make/model/revision?

 

[JayBird99]

WOW. I've never seen a stick or board do that. It's not reading any of the SPD info for the RAM stick for timings, OEM, Dates, nothing. That's REALLY interesting.

And your board is running up to date UEFI?

 

[Adilabdurahiman]

No they dont match at all
Is that a problem when installing ram?

 

[Adilabdurahiman]

WOW. I've never seen a stick or board do that. It's not reading any of the SPD info for the RAM stick for timings, OEM, Dates, nothing. That's REALLY interesting.

And your board is running up to date UEFI?

Yes i have updated to the latest bios

 

[JayBird99]

No they dont match at all
Is that a problem when installing ram?

VERY MUCH

They need to match as much as possible. Usually people buy the kit with two sticks that the two sticks are but one number apart, serial number wise... that close. That means that they're likely of the same BIN and can handle exactly the same voltage/speeds/XMP etc.

So yes, you need them as close as you can get them.

EDIT: You can see in the screenshots the week/year don't match and your JEDEC timings are all over the place between them. They do NOT match. You can see it's running them at the slowest possible denominator = 1600MHz

 

[JayBird99]

Yes i have updated to the latest bios

I would have the board replaced if this is happening when you just swap the RAM DIMMs. Sounds like some kind of problem with that DIMM slot. To me.. That's what I would do.

 

[COLGeek]

No they dont match at all
Is that a problem when installing ram?

Yes, these are likely just not compatible with each other. There is a reason memory is often sold in pairs, to ensure they will work together optimally.

 

[Adilabdurahiman]

https://imgur.com/D0Smju2

it shows 64gb in cpu z also

 

[COLGeek]

https://imgur.com/D0Smju2

it shows 64gb in cpu z also

If working, then good on you. Just be aware you could have issues later, especially if you try to increase the speed of the memory beyond the default speed. I would not enable XMP to ensure maximum stability.

Note, the memory appears to be running in single channel mode. No a showstopper, but less than optimal.