http://www.techradar.com/news/intel-has-finally-nailed-the-spectre-patch-but-only-for-skylake-pcs

Intel has pushed out a revamped Spectre patch which solves the previous issues that plagued the fix, but the bad news is it’s only been deployed for Skylake-powered PCs right now.

The new patch has been cured of the previous stability issues which triggered multiple system reboots in some cases, and led to Intel recommending that users shouldn’t install its own fix, as you may well recall.