Donate? Buy some of their products.
1. It pushes up the price which helps incentivize AMD executives and key employees who have an equity component to their remuneration
2. It makes it easier/cheaper for AMD to raise funding via equity or equity linked markets if they ever need to
At scale, either or both of those could help them though sales might be better
Buy some stock instead, don't just throw your money away. How would you even 'donate' to them?