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Intel Arc Pro B70 32GB.\n\nCritical flag: --device Vulkan2 is REQUIRED to pin execution to the B70. Without it, llama.cpp layer-splits across detected Vulkan devices (RTX 3090 + Intel iGPU + B70), and the iGPU running on system RAM becomes the bottleneck — observed regression from 107 t/s to ~22 t/s. 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