Yes, of course Intel and AMD have specialized testers for their chips, but they probably cost more like $100k, not just $10k. It's hard to see how a bad chip without any obviously-visible defect could ruin a good MB, so I wouldn't worry about that so much. Just get a few MBs (remember that the LGA775 CPU mounting mechanism is only guaranteed to work for 20 CPU mounting cycles), and run your favorite software to test the CPU.