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32 GB of ram, only 16 is read by bios, windows and ubuntu


s904s

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Hi everyone, I have an issue since some years that I have never succeeded to understand on what it depends I have a computer assembled by me with these features:

Processor: Intel i73770

Motherboard: asus P8z77-v deluxe

Ram: 32 GB, corsair CMz32GX3M4X1866C10

GPU: Gainward geforce 680

When I have assembled this pc for some months both windows and ubuntu they was reading 32 GB of ram fully. After some months suddenly it reads 16 GB of ram, from bios also if the rams are 1866 mhz I can take them only maximum to 1600 mhz. I can't understand why I have this issue and how to solve it. I attach to this conversation some screen of cpuz and windows properties.

Thank you for helping

 

http://imageshack.com/a/img924/2425/64OUPU.pnghttp://imageshack.com/a/img924/2834/tz8T1Z.pnghttp://imageshack.com/a/img921/8213/Cb2HXc.pnghttp://imageshack.com/a/img923/8479/0UmMWX.pnghttp://imageshack.com/a/img924/403/kNv8py.png

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When you look in 903-PC.txt then you should see:

DMI Memory Device		
designation		ChannelA-DIMM0
format			DIMM
type			unknown
total width		64 bits
data width		64 bits

DMI Physical Memory Array		
location		Motherboard
usage			System Memory
correction		None
max capacity		32768 MBytes
max# of devices		4

DMI Memory Device		
designation		ChannelA-DIMM1
format			DIMM
type			unknown
total width		64 bits
data width		64 bits
size			8192 MBytes

DMI Memory Device		
designation		ChannelB-DIMM0
format			DIMM
type			unknown
total width		64 bits
data width		64 bits

DMI Memory Device		
designation		ChannelB-DIMM1
format			DIMM
type			unknown
total width		64 bits
data width		64 bits
size			8192 MBytes

 

So the BIOS is only detecting two DIMMs. Try reseating the DIMMs and see if there are then all four. You should also see:

Memory Type			DDR3
Memory Size			32 GBytes
Channels			Dual
Memory Frequency		670.1 MHz (1:5)
CAS# latency (CL)		9.0
RAS# to CAS# delay (tRCD)	9
RAS# Precharge (tRP)		9
Cycle Time (tRAS)		24
Command Rate (CR)		2T

 

The Memory Size 32 GBytes comes from the SPD data.

 

Looing at Memory Frequency 670.1 MHz (1:5) then I wonder if XMP is enabled in the BIOS, is it?

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yes XMP is enabled in bios, I have reseated the RAMs, pratically I have two black slots and two blue slots, when I put the RAM two at time in same colour slots my pc detects 16 gb of ram, when I put for example a ram in black and another in blue my pc detects 8 GB of ram so it's like if pc or detects both blue slots ram or both black slots not both togheter.

and yes I have that informations in my report:

DMI Memory Device		
designation		ChannelA-DIMM0
format			DIMM
type			unknown
total width		64 bits
data width		64 bits

DMI Physical Memory Array		
location		Motherboard
usage			System Memory
correction		None
max capacity		32768 MBytes
max# of devices		4

DMI Memory Device		
designation		ChannelA-DIMM1
format			DIMM
type			unknown
total width		64 bits
data width		64 bits
size			8192 MBytes

DMI Memory Device		
designation		ChannelB-DIMM0
format			DIMM
type			unknown
total width		64 bits
data width		64 bits

DMI Memory Device		
designation		ChannelB-DIMM1
format			DIMM
type			unknown
total width		64 bits
data width		64 bits
size			8192 MBytes

 

Chipset
-------------------------------------------------------------------------

Northbridge			Intel Ivy Bridge rev. 09
Southbridge			Intel Z77 rev. 04
Graphic Interface		PCI-Express
PCI-E Link Width		x16
PCI-E Max Link Width		x16
Memory Type			DDR3
Memory Size			32 GBytes
Channels			Dual
Memory Frequency		670.1 MHz (1:5)
CAS# latency (CL)		9.0
RAS# to CAS# delay (tRCD)	9
RAS# Precharge (tRP)		9
Cycle Time (tRAS)		24
Command Rate (CR)		2T

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If you just install one DIMM in each of the four slots in turn do all four slots work?

 

What happened if you disable XMP in the BIOS and install all four DIMMs?

 

What is the reported DRAM voltage? CPUZ does not report this, but my SIV utility should as below. Is it the same with 1, 2 and 4 DIMMs installed?

 

attachment.php?attachmentid=26452&stc=1&d=1474034847

1402673194_ASUSP8Z77-VDeluxe.thumb.png.12e259ea6abca19c81c5424ac1495b70.png

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If you just install one DIMM in each of the four slots in turn do all four slots work?

 

What happened if you disable XMP in the BIOS and install all four DIMMs?

 

What is the reported DRAM voltage? CPUZ does not report this, but my SIV utility should as below. Is it the same with 1, 2 and 4 DIMMs installed?

 

If you just install one DIMM in each of the four slots in turn do all four slots work?

Yes they works 8 gb is detected

 

What happened if you disable XMP in the BIOS and install all four DIMMs?

If I disable or enable nothing changes

 

What is the reported DRAM voltage? CPUZ does not report this, but my SIV utility should as below. Is it the same with 1, 2 and 4 DIMMs installed?

 

http://imageshack.com/a/img922/8374/IWTrqN.png

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Is that with two or four DIMMs? SIV only reports the number of DIMMs the BIOS reports.

 

Try upping the DRAM voltage to 1.55 volts via the BIOS.

 

BTW the red blob indicates there have been disk errors, so you may wish to check the SMART error information.

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Is that with two or four DIMMs? SIV only reports the number of DIMMs the BIOS reports.

 

Try upping the DRAM voltage to 1.55 volts via the BIOS.

 

BTW the red blob indicates there have been disk errors, so you may wish to check the SMART error information.

 

That is with 4 DIMMs connected, I have tried upping DRAM voltage to 1.55 volts and to 1.6 volts nothing changes, I have also tried to overclocking them to 1866 mhz cause on the asus p8z77-v site on qvl list says that with timing 10-11-10-27 1.5 V I can reach 1866 mhz, I have tried to do that but when I do it and save settings the screen becomes black and the dram led turns always to red until I don't press mem_ok button and it restarts saying that overclock didn't gone good.

About the red blob I have connected a broken HDD that's why

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OK. The issue could be with any of the CPU, Motherboard or DIMMs and to figure out which you would need to have more hardware. Can you try the four DIMMs in a different system or four different DIMMs in this system?

 

If you haven't already try resetting the BIOS to defaults.

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I have tried the DIMMS in my friend pc and in his pc he gets 32 GB of ram and he can overclock them too up to 1866 mhz, setting 10-11-10-27, if I do the same on my pc it turns off without detecting RAMS, on my pc seems to work only at 1600 mhz mid ram 16 gb , yes I have tried many times resetting bios updating downgrading bios, my hypothesis it's that it can be an issue with ME of bios or CPU but how to check it?
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