That's my understanding as well. It's a dedicated clock directly on the module to allow for faster and more reliable clock signals, versus drawing it from the m

That's my understanding as well. It's a dedicated clock directly on the module to allow for faster and more reliable clock signals, versus drawing it from the motherboard where the signal could be generated very far away from the modules (relatively speaking). I suppose once signals are so low voltage and operating at such high frequencies, there start to be integrity issues.