There doesn't seem to be any surefire way to tell whether ECC is enabled on my system or not. DMIdecode shows a total width of 72 bits and data width of 64 bits, but it also says Error Correction Type: None.
This is on an Asus P9D-MV with supported memory (I have 2x4GB Samsung M391B5273DH0-YH9 ECC RAM). I have a Pentium G3250 (supports ECC, according to Intel) CPU.
Here's the dmidecode output:
# dmidecode 3.0
Scanning /dev/mem for entry point.
SMBIOS 2.7 present.
Handle 0x003E, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x003F
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM_A1
Bank Locator: BANK 0
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: [Empty]
Serial Number: [Empty]
Asset Tag: 9876543210
Part Number: [Empty]
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x003F, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 32 GB
Error Information Handle: Not Provided
Number Of Devices: 4
Handle 0x0040, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x003F
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: DIMM_A2
Bank Locator: BANK 1
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Samsung
Serial Number: 86C518E9
Asset Tag: 9876543210
Part Number: M391B5273DH0-YH9
Rank: 2
Configured Clock Speed: 1333 MHz
Handle 0x0042, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x003F
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM_B1
Bank Locator: BANK 2
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: [Empty]
Serial Number: [Empty]
Asset Tag: 9876543210
Part Number: [Empty]
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x0043, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x003F
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: DIMM_B2
Bank Locator: BANK 3
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Samsung
Serial Number: 86C51881
Asset Tag: 9876543210
Part Number: M391B5273DH0-YH9
Rank: 2
Configured Clock Speed: 1333 MHz
This is on an Asus P9D-MV with supported memory (I have 2x4GB Samsung M391B5273DH0-YH9 ECC RAM). I have a Pentium G3250 (supports ECC, according to Intel) CPU.
Here's the dmidecode output:
# dmidecode 3.0
Scanning /dev/mem for entry point.
SMBIOS 2.7 present.
Handle 0x003E, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x003F
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM_A1
Bank Locator: BANK 0
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: [Empty]
Serial Number: [Empty]
Asset Tag: 9876543210
Part Number: [Empty]
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x003F, DMI type 16, 23 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 32 GB
Error Information Handle: Not Provided
Number Of Devices: 4
Handle 0x0040, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x003F
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: DIMM_A2
Bank Locator: BANK 1
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Samsung
Serial Number: 86C518E9
Asset Tag: 9876543210
Part Number: M391B5273DH0-YH9
Rank: 2
Configured Clock Speed: 1333 MHz
Handle 0x0042, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x003F
Error Information Handle: Not Provided
Total Width: Unknown
Data Width: Unknown
Size: No Module Installed
Form Factor: DIMM
Set: None
Locator: DIMM_B1
Bank Locator: BANK 2
Type: Unknown
Type Detail: None
Speed: Unknown
Manufacturer: [Empty]
Serial Number: [Empty]
Asset Tag: 9876543210
Part Number: [Empty]
Rank: Unknown
Configured Clock Speed: Unknown
Handle 0x0043, DMI type 17, 34 bytes
Memory Device
Array Handle: 0x003F
Error Information Handle: Not Provided
Total Width: 72 bits
Data Width: 64 bits
Size: 4096 MB
Form Factor: DIMM
Set: None
Locator: DIMM_B2
Bank Locator: BANK 3
Type: DDR3
Type Detail: Synchronous
Speed: 1333 MHz
Manufacturer: Samsung
Serial Number: 86C51881
Asset Tag: 9876543210
Part Number: M391B5273DH0-YH9
Rank: 2
Configured Clock Speed: 1333 MHz
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