https://www.techradar.com/news/intels-spectre-fix-is-now-good-to-go-for-broadwell-and-haswell-processors

Last week, Intel released overhauled Spectre fixes for all its newest CPUs – from Skylake onwards – and now the firm has pushed out fresh patches for many Broadwell and Haswell processors too (5th- and 4th-gen models).

These are working Spectre patches that don’t cause the instability problems which the previous fixes did, which led to Intel recommending that folks don’t install them.