Claude Diagnosed a Faulty VRAM Byte Lane in a 4090 and Wrote a 32MB Quarantine Script That Fixed Years of Crashes

r/ClaudeAI·medium signalXBlueskyLinkedInCopy link

The top r/ClaudeAI post of the day, at 862 upvotes and 116 comments, describes a 4090 with a few kilobytes of bad VRAM that consumer cards cannot detect because they lack ECC, causing random crashes for years. Claude identified the specific faulty byte lane and wrote a startup Python script that locates the bad physical region and allocates it, reserving a 32MB quarantine so nothing else can touch it, and the crashes stopped. The solution is on GitHub, and the comment thread turned into a long list of similar hardware diagnoses, which is a use case that gets almost no coverage next to code generation.