What is the SPD-EEPROM information

The SPD-EEPROM information is static information from the installed memory bars. In toolstar®testLX and toolstar®testWIN this information can be displayed on the screen. You can find the menu item under Components -> Memory -> SPD EEPROMs.

What does SPD EEPROM mean?

SPD stands for Serial Presence Detect. Various static values ​​are stored in the SPD-EEPROM area of ​​memory bars, which are mainly used to configure the hardware during the boot process. The BIOS uses this information to adjust the memory controller to the installed bars.

Meaningful use of the provided informations

For you as a user of our software, information such as manufacturer, production date, timing and serial number are particularly interesting. This allows you to specifically order memory bars that exactly fit this device. This can be very helpful, especially for older bars without printing.

The most important values ​​of the SPD-EEPROM information

  • Manufacturer
    What is the manufacturer of the module (Kingston, Samsung, etc.)?
  • Serial number
    The serial number of the module for warranty claims, etc.
  • Date of Manufacture
    When was the bar made? This way you can order exact replacement parts.
  • Automatic error detection
    Does this memory bar support automatic error detection?
  • Supported latencies
    Within what latencies can the bolt operate?
  • Maximum bandwidth
    The maximum supported bandwidth of the storage bar.
  • Maximum and minimum operating temperature
    Within which temperature ranges can the storage bar be operated safely?
  • Speed
    DDR3, etc.

Timing warning in the program?

Basically, the data in the SPD-EEPROM DIMMS are purely informational values. However, certain values ​​are required by the system to properly configure the storage controller. This includes, for example, timing information. So at what timing the bolt needs to be addressed. If this information is missing, the BIOS will in most cases use a generic timing. So the device starts. However, the memory controller cannot access optimally and the system is slower than it actually should be. This generically selected timing may also lead to problems under high loads and crashes during operation. toolstar®testLX and toolstar®testWIN will automatically notify you when you access the information or the SPD in the long-term test -Have EEPROM information checked.

Information that is otherwise available is missing

Not every manufacturer enters all the information. It can happen that certain fields that are present in other bars are completely missing or that information is simply filled with nonsense. Such as a manufacturing date of 01/01/1900 or the serial number 0000000.

Error message: No DIMMs with SPD EEPROM found

The SPD-EEPROM information is generally accessed and read out in a standardized manner. However, if the manufacturer's motherboard or firmware does not adhere to a specific standard, the driver may not be able to find the information or read it correctly. If this is the case, you will receive the message: No DIMMs with SPD EEPROM found. Unfortunately, reading is not possible on this device. You are welcome to report this error to us. It is important that you send us a description and attach an overview for support purposes to the email. Toolhouse may then be able to adapt the program so that this special case is also handled.

Example output of the SPD EEPROM of a memory bar

Critical information such as serial numbers and manufacturing dates have been replaced with “X”.

DIMM  #1: 4096 MB DDR3

                    Revision: v1.0
             SPD-EEPROM size: 256 bytes; 176 bytes used
          Module type/length: Unbuffered DIMM, 133.35 mm
              Physical banks: 8
              Rows x Columns: 15 x 10
                     Voltage: not 1.2X V operable
                              not 1.35 V operable
                              not 1.5 V operable
             Number of ranks: 2
          SDRAM device width: 8 bits
             Error detection: none
                  Data width: 64 bits
         Supported Latencies: CL6 CL7 CL8 CL9 
           Maximum bandwidth: PC3-10667 (667 MHz)
        Speed classification: DDR3-1333
              Fine Time Base: 2,500 ps
            Medium Time Base: 0,125 ns
                     tCK min: 1,500 ns
                     tAA min: 13,125 ns
                     tWR min: 15,000 ns
                    tRTC min: 13,125 ns
                    tRRD min: 6,000 ns
                     tRP min: 13,125 ns
                    tRAS min: 36,000 ns
                     tRC min: 49,125 ns
                    tRFC min: 160,000 ns
                    tWTR min: 7,500 ns
                    tRTP min: 7,500 ns
                    tFAW min: 30,000 ns
                    DLL mode: supported
                     RZQ / 7: supported
                     RZQ / 6: supported
  Partial Array Self Refresh: not supported
                ODTS Readout: not supported
     Auto Self Refresh (ASR): supported
      Extended Resfresh Rate: 2X
  Extended Temperature Range: 0-95°C
              Thermal Sensor: not available
           SDRAM Device Type: non-standard device

                Manufacturer: Kingston
          Manufacturing date: week XX/20XX
      Manufacturing location: 4
               Serial number: XX XX XX XX (XXXXXXXXX)
                    Checksum: okay
          Module part number: XXXXX03-XX8.XXXXF 
           DRAM manufacturer: Hyundai Electronics

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