diff --git a/audit/internal/platform/benchmark.go b/audit/internal/platform/benchmark.go
index 1b4e4d2..6984726 100644
--- a/audit/internal/platform/benchmark.go
+++ b/audit/internal/platform/benchmark.go
@@ -220,8 +220,6 @@ func benchmarkCalibrationThrottleReason(before, after BenchmarkThrottleCounters)
 		return "hw_thermal"
 	case diff.SWThermalSlowdownUS > 0:
 		return "sw_thermal"
-	case diff.HWPowerBrakeSlowdownUS > 0:
-		return "hw_power_brake"
 	default:
 		return ""
 	}
diff --git a/audit/internal/platform/benchmark_test.go b/audit/internal/platform/benchmark_test.go
index 92b26a4..9b2c5da 100644
--- a/audit/internal/platform/benchmark_test.go
+++ b/audit/internal/platform/benchmark_test.go
@@ -164,6 +164,24 @@ func TestBenchmarkPlannedPhaseStatus(t *testing.T) {
 	}
 }
 
+func TestBenchmarkCalibrationThrottleReasonIgnoresPowerReasons(t *testing.T) {
+	t.Parallel()
+
+	before := BenchmarkThrottleCounters{}
+	if got := benchmarkCalibrationThrottleReason(before, BenchmarkThrottleCounters{SWPowerCapUS: 1_000_000}); got != "" {
+		t.Fatalf("sw_power_cap should be ignored, got %q", got)
+	}
+	if got := benchmarkCalibrationThrottleReason(before, BenchmarkThrottleCounters{HWPowerBrakeSlowdownUS: 1_000_000}); got != "" {
+		t.Fatalf("hw_power_brake should be ignored, got %q", got)
+	}
+	if got := benchmarkCalibrationThrottleReason(before, BenchmarkThrottleCounters{HWThermalSlowdownUS: 1_000_000}); got != "hw_thermal" {
+		t.Fatalf("hw_thermal mismatch: got %q", got)
+	}
+	if got := benchmarkCalibrationThrottleReason(before, BenchmarkThrottleCounters{SWThermalSlowdownUS: 1_000_000}); got != "sw_thermal" {
+		t.Fatalf("sw_thermal mismatch: got %q", got)
+	}
+}
+
 func TestNormalizeNvidiaBenchmarkOptionsPreservesRunNCCLChoice(t *testing.T) {
 	t.Parallel()