ECC vs. Non-ECC Memory
ECC vs. Non-ECC Memory

ECC memory, known for its error-correcting capabilities, is crucial for high-availability systems like servers, while non-ECC memory is more common in consumer devices. Determining which type of memory your system uses is important for compatibility and performance considerations. The easy way to tell? Count the number of memory chips on the module. If the count is ODD, you likely have ECC. If it’s EVEN, you have non-ECC.

Identifying ECC vs. Non-ECC Memory:

  1. Physical Inspection:
    • Count the number of memory chips on each module. ECC memory typically has an odd number of chips or a number divisible by 3 or 5, usually 9 chips, while non-ECC memory usually has an even number, typically 8 chips​​​​​​.
  2. Checking the System Information (Windows and macOS):
    • Windows: Open the System Information app, navigate to the Components section, and select Memory. The ECC status should be displayed in the right-hand pane, under “Memory Slots”​​.
    • macOS: Open the System Information app, select the Hardware section, then Memory. Look for the “ECC Supported” row. If it says “Yes,” you have ECC memory.
  3. Using Command Line (Linux):
  4. Manufacturer’s Website or Datasheet:
    • Consult the manufacturer’s website or the memory module’s datasheet. Manufacturers typically specify whether the memory is ECC or non-ECC.

Why ECC Memory?

  • ECC memory is more reliable and can correct single-bit errors, making it ideal for systems where data integrity is critical. However, it’s more expensive and can decrease your computer’s performance by about 2 percent. Non-ECC memory, or non-parity memory, lacks this error-detecting feature and is typically sufficient for general consumer use due to the stability of current DRAM technology​​.


Determining whether you have ECC or non-ECC memory involves a few simple checks. The type of memory you need depends on your system’s requirements and the criticality of error correction for your tasks.


  1. How does ECC memory affect performance?
    • ECC memory can reduce system performance slightly, about 2 percent, due to its error-correcting processes​​.
  2. Can I mix ECC and non-ECC memory?
    • Generally, it’s not advisable to mix ECC and non-ECC memory as they are designed for different purposes and systems.
Eric Chan

Hi! I’m Eric and I work on the knowledge base at  You can see some of my writings about technology, cellphone repair, and computer repair here.

When I’m not writing about tech I’m playing with my dog or hanging out with my girlfriend.

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