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If you do not see an option for ECC memory when searching for your memory upgrade, your system most likely has non-ECC memory installed and will not support ECC memory. In this case, you should upgrade your system with non-ECC memory (standard).
If your system has ECC memory, you should choose the upgrade option with "w/ECC". If you determine that your system is using non-ECC (standard) memory, you should select the upgrade without ECC in the description.
There is a slight decrease in performance, but it's usually approximately 3-4% on PC133 CAS2 ECC SDRAM insignificant since 3% is barely within the margin of error on benchmarks
ECC more expensive than Non-ECC, but not all motherboards support ECC ram. check with your Motherboard manufacturer before purchasing Ecc Memory. It's often used in high end systems, or servers.