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Testing reveals that Intel consumer platforms like Z890 with Arrow Lake CPUs have hardware/firmware limitations that prevent proper PCIe Peer-to-Peer (P2P) communication between multiple GPUs, making them unsuitable for multi-GPU AI workloads despite adequate lane counts.
AMD removed Transparent Secure Memory Encryption (TSME) from its consumer Ryzen CPUs without notice, causing user backlash. The change was detected through firmware updates and appears to be a deliberate restriction to differentiate Pro chips.