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targeted_stress, targeted_power, and the Level 2/3 diag were dispatched one GPU at a time from the UI, turning a single dcgmi command into 8 sequential ~350–450 s runs. DCGM supports -i with a comma-separated list of GPU indices and runs the diagnostic on all of them in parallel. Move nvidia, nvidia-targeted-stress, nvidia-targeted-power into nvidiaAllGPUTargets so expandSATTarget passes all selected indices in one API call. Simplify runNvidiaValidateSet to match runNvidiaFabricValidate. Update sat.go constants and page_validate.go estimates to reflect all-GPU simultaneous execution (remove n× multiplier from total time estimates). Stress test on 8-GPU system: ~5.3 h → ~2.5 h. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>