RAM: 16GB recognized in BIOS out of 32 installed
Bob-Leponge
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Bob-Leponge Posted messages 8 Status Membre -
Bob-Leponge Posted messages 8 Status Membre -
Hello everyone,
Following a BIOS update for the installation of Windows 10, I am only recognizing 16 GB of RAM out of the 32 installed.
I don't think it's a hardware issue, but rather a BIOS configuration problem.
The config is from 2012:
Motherboard: Asus Z9PE-D8_WS (BIOS version 5802)
CPU: 2xIntel Xeon E5-2620 (2GHz)
RAM: Corsair 4x8GB DDR3 1600MHz
SSD: 256GB
GPU: Nvidia Geforce GTX 670 2GB
OS: Windows 10 Pro 64bit
I have read a lot of threads on the subject, so I have already tried quite a few things, but without success.
Tests already performed:
- Windows setting "Maximum Memory" disabled
- Memory diagnostic; no problems
- Swapping RAM sticks: no change
- "Optimize Defaults" in BIOS setup
- Frequency and voltage settings for the RAM manually entered in BIOS
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I haven't tried starting the PC by adding the sticks one by one (first with 8GB, then 16, ...) because each time I have to take apart the entire air cooling system of the CPUs to access the RAM...
The BIOS only recognizes two sticks:
CPU Socket 1 DIMM Information
DIMM_A1 Present 8192 MB Independ
DIMM_B1 Present 8192 MB Independ
DIMM_C1 Not Present
DIMM_D1 Not Present
CPU Socket 2 DIMM Information
DIMM_E1 Present 0 MB Independ <=
DIMM_F1 Present 0 MB Independ <=
DIMM_G1 Not Present
DIMM_H1 Not Present
Unlike Windows, which shows me in the settings:
And in the resource monitor:
Any ideas, opinions, suggestions?
Thank you in advance for any help you can provide.
Following a BIOS update for the installation of Windows 10, I am only recognizing 16 GB of RAM out of the 32 installed.
I don't think it's a hardware issue, but rather a BIOS configuration problem.
The config is from 2012:
Motherboard: Asus Z9PE-D8_WS (BIOS version 5802)
CPU: 2xIntel Xeon E5-2620 (2GHz)
RAM: Corsair 4x8GB DDR3 1600MHz
SSD: 256GB
GPU: Nvidia Geforce GTX 670 2GB
OS: Windows 10 Pro 64bit
I have read a lot of threads on the subject, so I have already tried quite a few things, but without success.
Tests already performed:
- Windows setting "Maximum Memory" disabled
- Memory diagnostic; no problems
- Swapping RAM sticks: no change
- "Optimize Defaults" in BIOS setup
- Frequency and voltage settings for the RAM manually entered in BIOS
-
I haven't tried starting the PC by adding the sticks one by one (first with 8GB, then 16, ...) because each time I have to take apart the entire air cooling system of the CPUs to access the RAM...
The BIOS only recognizes two sticks:
CPU Socket 1 DIMM Information
DIMM_A1 Present 8192 MB Independ
DIMM_B1 Present 8192 MB Independ
DIMM_C1 Not Present
DIMM_D1 Not Present
CPU Socket 2 DIMM Information
DIMM_E1 Present 0 MB Independ <=
DIMM_F1 Present 0 MB Independ <=
DIMM_G1 Not Present
DIMM_H1 Not Present
Unlike Windows, which shows me in the settings:
And in the resource monitor:
Any ideas, opinions, suggestions?
Thank you in advance for any help you can provide.
7 réponses
To start with, your 1600 MHz RAM is overkill. Your processors only support 800/1066/1333 MHz. For your hardware reserved RAM issue, you can try this: http://www.aidewindows.net/bios.php#memory_remap_feature
Otherwise, you should try swapping the modules in the slots. It will take some time, but it might solve the problem.
Otherwise, you should try swapping the modules in the slots. It will take some time, but it might solve the problem.
Thank you for your response.
There is no "Memory Remap Feature" option in this BIOS.
Additionally, it's meant to recognize more than 4GB for 64-bit systems, and it already recognizes 16GB.
As for the RAM frequency, I'm not sure; it has been working fine until now for over three years.
I will check; they are probably indeed clocked at 1333MHz.
I will reset the BIOS to default settings and add the sticks one by one. It might be an issue with poorly managed dual channel?
Do you think I can safely start the PC without the GPU fans to perform these tests? Or do I need to reassemble everything each time?
I will spend my evening on this. ;)
More to come next time.
There is no "Memory Remap Feature" option in this BIOS.
Additionally, it's meant to recognize more than 4GB for 64-bit systems, and it already recognizes 16GB.
As for the RAM frequency, I'm not sure; it has been working fine until now for over three years.
I will check; they are probably indeed clocked at 1333MHz.
I will reset the BIOS to default settings and add the sticks one by one. It might be an issue with poorly managed dual channel?
Do you think I can safely start the PC without the GPU fans to perform these tests? Or do I need to reassemble everything each time?
I will spend my evening on this. ;)
More to come next time.
Hi, first yes, BIOS default settings.
Then have you tried putting the two XEON 0 modules in the XEON 1 slots? Just two modules and start to see if it boots or not?
Regarding the frequency, as Pilopilo007 said, your CPU supports a maximum of 1333MHz unless it's a V3 at 2.40 GHz, so even if you put in 1600, it will stay at a maximum of 1333.
So this could cause issues and it may be that only two modules are supported because they are 1600.
Then have you tried putting the two XEON 0 modules in the XEON 1 slots? Just two modules and start to see if it boots or not?
Regarding the frequency, as Pilopilo007 said, your CPU supports a maximum of 1333MHz unless it's a V3 at 2.40 GHz, so even if you put in 1600, it will stay at a maximum of 1333.
So this could cause issues and it may be that only two modules are supported because they are 1600.
Hi,
Yes, I have already swapped the two RAM sticks from one processor to another, and the PC starts up without issues.
And it still recognizes 16GB.
As for the frequency, it must have been my mistake in the description.
On the hardware side, nothing has changed; everything was working fine before the BIOS update.
Thank you for your response.
Yes, I have already swapped the two RAM sticks from one processor to another, and the PC starts up without issues.
And it still recognizes 16GB.
As for the frequency, it must have been my mistake in the description.
On the hardware side, nothing has changed; everything was working fine before the BIOS update.
Thank you for your response.
If they are not recognized in the BIOS, there's no point in looking at Windows.
You say you have updated your BIOS (no Windows 10 certification in version 5802), do you have the option to downgrade and revert to the previous version, or will Windows 10 no longer work?
After some research, your motherboard does not support Windows 10 but only 8.1 at most, so I don't think it will change anything if the RAM modules are not recognized in the BIOS.
I also found this which might be interesting:
http://dlcdnet.asus.com/pub/ASUS/server/ESC2000_G2/Manual&QVL/ESC2000_G2_Z9PE-D8_WS_AVL_UDIMM_20160219.pdf
You say you have updated your BIOS (no Windows 10 certification in version 5802), do you have the option to downgrade and revert to the previous version, or will Windows 10 no longer work?
After some research, your motherboard does not support Windows 10 but only 8.1 at most, so I don't think it will change anything if the RAM modules are not recognized in the BIOS.
I also found this which might be interesting:
http://dlcdnet.asus.com/pub/ASUS/server/ESC2000_G2/Manual&QVL/ESC2000_G2_Z9PE-D8_WS_AVL_UDIMM_20160219.pdf
I just updated the BIOS for the upgrade to Windows 10, as it was incompatible.
I am going to try to downgrade the BIOS to version 0503, which seems suitable for my hardware according to the document you mentioned.
I also found another thread about people having issues with the upgrade to Windows 10 on the Z9PE-D8_WS because of an incorrect BIOS version...
Everything works for them now after doing a gradual BIOS update,
I first installed version 3109 as stated on the Asus website, then directly the latest version... bad idea.
I think we have a lead here!!!
I will try this tonight when I get home from work.
Thank you very much anyway.
I am going to try to downgrade the BIOS to version 0503, which seems suitable for my hardware according to the document you mentioned.
I also found another thread about people having issues with the upgrade to Windows 10 on the Z9PE-D8_WS because of an incorrect BIOS version...
Everything works for them now after doing a gradual BIOS update,
I first installed version 3109 as stated on the Asus website, then directly the latest version... bad idea.
I think we have a lead here!!!
I will try this tonight when I get home from work.
Thank you very much anyway.
Please, the weird thing is that nowhere is it stated that this update allows the installation of Windows 10
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State of play:
I pulled my hair out (what's left of it) for hours:
- with the BIOS and its various versions,
- with the RAM sticks and all possible configurations (which allowed me to confirm that all are functional)
- with Windows settings
- with BIOS settings (which I only have a moderate grasp of...)
Then I went back to my initial setup with Windows 7 Pro
... and still 16GB of RAM recognized in the BIOS
CPU Socket 1 DIMM Information
DIMM_A1 Present 8192 MB Independent
DIMM_B1 Present 8192 MB Independent
CPU Socket 2 DIMM Information
DIMM_E1 Present disable <=
DIMM_F1 Present disable <=
In short, the Windows 10 experience was a complete disaster,
proving that when a machine runs well, why force updates at all costs, even out of curiosity!!!
In the meantime, I don't know how to recover that 32GB...
The CPU2 slots couldn't have burned out just because of a BIOS update, could they?
On the ASUS splash screen at startup, it clearly displays the 32GB of RAM,
Windows 10 also detected them (32 installed, 16 available)
The CPU-Z software correctly detects the 4 sticks of 8GB
There's a line in the BIOS configuration that's acting up, but my knowledge in this area is too limited to know which parameter to modify.
I pulled my hair out (what's left of it) for hours:
- with the BIOS and its various versions,
- with the RAM sticks and all possible configurations (which allowed me to confirm that all are functional)
- with Windows settings
- with BIOS settings (which I only have a moderate grasp of...)
Then I went back to my initial setup with Windows 7 Pro
... and still 16GB of RAM recognized in the BIOS
CPU Socket 1 DIMM Information
DIMM_A1 Present 8192 MB Independent
DIMM_B1 Present 8192 MB Independent
CPU Socket 2 DIMM Information
DIMM_E1 Present disable <=
DIMM_F1 Present disable <=
In short, the Windows 10 experience was a complete disaster,
proving that when a machine runs well, why force updates at all costs, even out of curiosity!!!
In the meantime, I don't know how to recover that 32GB...
The CPU2 slots couldn't have burned out just because of a BIOS update, could they?
On the ASUS splash screen at startup, it clearly displays the 32GB of RAM,
Windows 10 also detected them (32 installed, 16 available)
The CPU-Z software correctly detects the 4 sticks of 8GB
There's a line in the BIOS configuration that's acting up, but my knowledge in this area is too limited to know which parameter to modify.
Have you tried one stick for each CPU? You can clearly see 8 GB detected, right? And does it work with 3 sticks?
I also read to try turning it on with one stick, then turning it off and turning it back on with a second one, then a third, and finally with the fourth for detection; let's see.
I also read to try turning it on with one stick, then turning it off and turning it back on with a second one, then a third, and finally with the fourth for detection; let's see.
Yes, I did all of those operations,
it was actually long to take apart and put back together the fans and air cooling each time ;)
but it doesn't detect anything on the second CPU
I can't downgrade the BIOS to the original version (which was functional for Windows 7)
I think I'll have to completely reset it.
Thanks for your suggestions anyway.
it was actually long to take apart and put back together the fans and air cooling each time ;)
but it doesn't detect anything on the second CPU
I can't downgrade the BIOS to the original version (which was functional for Windows 7)
I think I'll have to completely reset it.
Thanks for your suggestions anyway.