Intel updated its patching guidance for Spectre this week, continuing the months-long process of fixing the critical security flaw.

Although the company had previously said it planned to patch all affected chips, today it clarified that some product lines won’t receive updates.

Most are older and, presumably, not as widely used.

They include: the Bloomfield line, Clarksfield, Gulftown, Harpertown, Jasper Forest, Penryn, SoFIA 3GR, the Wolfdale line, and the Yorkfield line.

Intel says it’s stopped production of these fixes for three reasons, in its words:

-Micro-architectural characteristics that preclude a practical implementation of features mitigating Variant 2 (CVE-2017-5715)

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