From the linked article: Modern RAM is believed, with much justification, to be reliable, and error-detecting RAM has largely fallen out of use for non-critica

From the linked article: Modern RAM is believed, with much justification, to be reliable, and error-detecting RAM has largely fallen out of use for non-critical applications. By the mid-1990s, most DRAM had dropped parity checking as manufacturers felt confident that it was no longer necessary.