50% ram showing

[FumblingBafoon]

I've spent a good 45mins searching and tried all the things I have read but no dice so I thought I'd ask for help.

In Truenas Core 13.0-U5.3 my system only shows as 3.9GB total available memory. However, I have 2x4GB sticks installed.

In the shell, I have typed uname -m to which it outputs amd64 so assuming I have the 64 bit version of TruenasCore installed.

I have taken out the memory and reseated them multiple times.

I have taken out the MOBO and replaced it.

"dmesg | grep -i memory" shows as 4096mb real with 3810mb available.

dmidecode -t memory
# dmidecode 3.3
Scanning /dev/mem for entry point.
SMBIOS 2.6 present.

Handle 0x0029, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 32 GB
Error Information Handle: No Error
Number Of Devices: 4

Handle 0x002C, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: A1_DIMM0
Bank Locator: A1_BANK0
Type: Unknown
Type Detail: Synchronous
Speed: Unknown
Manufacturer: A1_Manufacturer0
Serial Number: A1_SerNum0
Asset Tag: A1_AssetTagNum0
Part Number: Array1_PartNumber0
Rank: Unknown

Handle 0x002F, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: 4 GB
Form Factor: DIMM
Set: None
Locator: A1_DIMM1
Bank Locator: A1_BANK1
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MT/s
Manufacturer: Undefined
Serial Number: A91B6381
Asset Tag: A1_AssetTagNum1
Part Number: CT51264BD160B.C16F
Rank: 2

Handle 0x0032, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: A1_DIMM2
Bank Locator: A1_BANK2
Type: Unknown
Type Detail: Synchronous
Speed: Unknown
Manufacturer: A1_Manufacturer2
Serial Number: A1_SerNum2
Asset Tag: A1_AssetTagNum2
Part Number: Array1_PartNumber2
Rank: Unknown

Handle 0x0035, DMI type 17, 28 bytes
Memory Device
Array Handle: 0x0029
Error Information Handle: No Error
Total Width: 64 bits
Data Width: 64 bits
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: A1_DIMM3
Bank Locator: A1_BANK3
Type: Unknown
Type Detail: Synchronous
Speed: Unknown

Its an old PC I've just converted to run as a NAS.

Lenovo h330
Intel(R) Core(TM) i5-2320 CPU @ 3.00GHz
Not sure on the MOBO
2x4GB RAM.
Sandisk 256GB SSD boot drive
Dell PERC H310 HBA with 5X WD40EFRX (RaidZ1) and 2X WD20EFRX (Mirror).

 

[Ericloewe]

Clearly, per dmidecode, only a single DIMM is being recognized. It could be a faulty DIMM, faulty motherboard or CPU socket, faulty CPU, poor connection at any point, or just plain incompatible combination.