They hope to avoid melting by doing the launch at night.
MI455X is what AMD will sell to Anthropic (in the form of complete Helios racks, with EPYC servers full of GPUs) in the deal discussed in a couple of other HN threads (Reuters title: "AMD to sell Anthropic tens of billions in AI servers, invest up to $5 billion in startup"), i.e. Anthropic will not pay all in cash, but $5B will be paid by giving a share to AMD.
so more circular cash strcuture; we're in Dot Com Boom 2: Electric GPUoogaloo
i really do wonder what the reason for all this circular financing? what are they trying to accomplish here?