These days ECC testing is supposed to be integrated into the CPUs. Enthusiast testing seems to support this with overhead being <0.5% even for Reg ECC: https:

These days ECC testing is supposed to be integrated into the CPUs. Enthusiast testing seems to support this with overhead being <0.5% even for Reg ECC: https://www.pugetsystems.com/labs/articles/ECC-and-REG-ECC-Memory-Performance-560/#Conclusion https://www.pugetsystems.com/labs/articles/ECC-and-REG-ECC-M...