There’s been of a hoo-ha since the launch of the Assassin’s Creed Odyssey because it doesn’t run at all on CPUs that lack AVX extension support. In particular, this affected 1st-Gen Intel Core i3, i5, i7, Pentium G and some Intel Xeon processors.

“Thanks to your support, we were able to identify the common cause of a few instances of reported crashes: the impacted CPUs didn’t support AVX” said Ubisoft at the time. AVX, or Advanced Vector Extensions, refers to a set of CPU instructions first introduced in 2011. Assassin’s Creed Odyssey was built to use these instructions and likely wasn’t actually tested on 1st Intel Core processors, meaning there was no compatibility.

Since then, Ubisoft has been busy working on a fix. are now actively working on a solution to extend the supported CPUs for our players to be able to run Assassin’s Creed Odyssey without AVX support, within the minimum requirements.”

A new AC Odyssey PC patch version 1.03 has now rolled out which appears to fix the problem. There is no mention of a fix in the meagre patch notes, but players with affected processors are now reporting Assassin’s Creed Odyssey runs correctly.

Assassin’s Creed Odyssey PC Patch 1.03 Key Notes

  • Implemented some “quality-of-life” and usability improvement features
  • Addressed various “game breaking” issues that could happen in specific conditions
  • Improved performance and stability

The patch size on PC is about 1.9GB and it’s available right now through both Uplay and Steam.