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Dell Precision 5520 allowing ECC RAM of higher speed only when combined with non ECC RAM
I found this discussion https://news.ycombinator.com/item?id=14756849 but my mileage did vary based on my experience which matched with https://www.reddit.com/r/Dell/comments/1eloegs/dell_precision_5520_xeon_not_detecting_ram_ecc/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button, where the machine did not boot giving "power on not applicable" when an ECC RAM is installed alone without a non-ECC RAM (when combined it was fine)