The premise of your comment is excellent - the fiber weave effect you describe is not often considered although the two dielectric materials contained are glass

The premise of your comment is excellent - the fiber weave effect you describe is not often considered although the two dielectric materials contained are glass bundles and resin (instead of air). I would highly recommend Bert Simonovich's publications for anyone interested in more ([1] for example). It's worth noting that DDR4 isn't really fast enough to consider "non-Euclidean" traces, though when it comes to the weave you should always be working with your fabricator to use mechanically spread glass adjacent to these high speed signals. For anyone with more questions in this area of high speed digital design, feel free to reach out to me (contact info in profile) - I love the topic. [1] https://blog.lamsimenterprises.com/2011/01/08/fiber-weave-effect-timing-skew/ https://blog.lamsimenterprises.com/2011/01/08/fiber-weave-ef...