diff --git a/benchmarks/rocm/bench_block_sparse_attention.py b/benchmarks/rocm/bench_block_sparse_attention.py
index fd9ecb25833..9ebbc68924d 100644
--- a/benchmarks/rocm/bench_block_sparse_attention.py
+++ b/benchmarks/rocm/bench_block_sparse_attention.py
@@ -236,6 +236,10 @@ def _sweep(kinds, dry_run_iters: int, repeat_iters: int, nb: int, seed: int) ->
                         "num_kv_heads": num_kv,
                         "density": density,
                         "num_blocks": nb,
+                        # Layout and inputs are both seed-derived, so two
+                        # seeds at one density time differently; without
+                        # this the rows are indistinguishable.
+                        "seed": seed,
                     }
                     try:
                         if kind == "variable":
@@ -402,6 +406,10 @@ def main() -> None:
             "block size would shrink the sparse problem below the dense baseline."
         )
 
+    # --seed reached only the block mask; q/k/v came from the global RNG,
+    # so the seed recorded per row did not pin --accuracy's inputs.
+    torch.manual_seed(args.seed)
+
     for key, value in _provenance().items():
         print(f"# {key}: {value}")
 
diff --git a/benchmarks/rocm/testlist_rocm.txt b/benchmarks/rocm/testlist_rocm.txt
index 4c3621bb29a..4f4101b6f3e 100644
--- a/benchmarks/rocm/testlist_rocm.txt
+++ b/benchmarks/rocm/testlist_rocm.txt
@@ -78,12 +78,16 @@
 --routine BatchPrefillWithRaggedKVCacheWrapper --backends fa2 auto --batch_size 16 --s_qo 1024 --s_kv 1024 --num_qo_heads 64 --num_kv_heads 8 --head_dim_qk 128 --head_dim_vo 128 --causal --q_dtype bfloat16 --kv_dtype bfloat16 --refcheck --generate_repro_command --case_tag "Llama-3.1-70B"
 --routine BatchPrefillWithRaggedKVCacheWrapper --backends fa2 auto --batch_size 4 --s_qo 4096 --s_kv 4096 --num_qo_heads 64 --num_kv_heads 8 --head_dim_qk 128 --head_dim_vo 128 --causal --q_dtype bfloat16 --kv_dtype bfloat16 --refcheck --generate_repro_command --case_tag "Llama-3.1-70B"
 
-## Norm -- bf16 and fp16
+## Norm -- bf16
 # The backend column reads "cuda": these routines take no backend argument, so
 # each op runs at its own default, which for norm and rope is native. For the
 # native-vs-AITER comparison run rocm/bench_norm.py with no flag; --aa there is
 # native against itself, i.e. the noise floor a ratio has to clear.
 #
+# fp16 is deliberately absent: vec_size is gcd(16/sizeof(T), d) and both
+# 2-byte types give the same one, so fp16 would re-run this path for
+# numerical noise alone.
+#
 # hidden_size 111 is in the sweep on purpose: the native kernel's vec_size is
 # gcd(16/sizeof(T), d), so an ill-aligned d goes fully scalar. A powers-of-two
 # sweep never sees it.
diff --git a/benchmarks/routines/rocm/support.py b/benchmarks/routines/rocm/support.py
index 4aef6ef5108..1e3d6905125 100644
--- a/benchmarks/routines/rocm/support.py
+++ b/benchmarks/routines/rocm/support.py
@@ -31,8 +31,8 @@
     # norm
     "rmsnorm": ("rmsnorm", _NATIVE),
     "fused_add_rmsnorm": ("fused_add_rmsnorm", _NATIVE),
-    "gemma_rmsnorm": ("layernorm", _NATIVE),
-    "gemma_fused_add_rmsnorm": ("layernorm", _NATIVE),
+    "gemma_rmsnorm": ("gemma_rmsnorm", _NATIVE),
+    "gemma_fused_add_rmsnorm": ("gemma_rmsnorm", _NATIVE),
     # rope. apply_rope_with_cos_sin_cache is absent: the routine builds
     # cos_sin_cache in --input_dtype, but the op requires float32 and
     # --input_dtype offers none, so it fails on CUDA too.
diff --git a/tests/rocm/test_arch_caps.py b/tests/rocm/test_arch_caps.py
index eacdfedccc2..fed1d36ff9b 100644
--- a/tests/rocm/test_arch_caps.py
+++ b/tests/rocm/test_arch_caps.py
@@ -293,6 +293,46 @@ def test_every_op_the_library_asks_for_is_declared(self):
             f"{sorted(used - declared)}"
         )
 
+    def test_benchmark_registry_ops_are_declared(self):
+        """The benchmark registry names capability ops; check the targets exist.
+
+        Parsed rather than imported: this lane has no torch, and support.py
+        reaches flashinfer. It is also why the regex scan above cannot cover it
+        -- support.py passes `op` as a variable, so the strings live in a dict
+        literal and never appear at a call site.
+
+        `layernorm` sat here until arch_caps stopped declaring it; git merged
+        both changes cleanly and two Gemma routines silently stopped producing
+        rows. tests/rocm/test_benchmark_harness.py catches it too, but runs on
+        no CI lane.
+        """
+        import ast
+
+        root = pathlib.Path(__file__).resolve().parents[2]
+        src = root / "benchmarks" / "routines" / "rocm" / "support.py"
+        tree = ast.parse(src.read_text())
+        referenced = set()
+        for node in ast.walk(tree):
+            if not isinstance(node, ast.Assign):
+                continue
+            if not any(
+                isinstance(t, ast.Name) and t.id == "_ROCM_ROUTINE_TO_CAP_OP"
+                for t in node.targets
+            ):
+                continue
+            for value in node.value.values:
+                op = value.elts[0]
+                assert isinstance(op, ast.Constant), f"non-literal cap op: {op!r}"
+                referenced.add(op.value)
+
+        assert referenced, "no capability ops parsed; the registry moved or renamed"
+        assert "rmsnorm" in referenced, "parse found no known op; the shape changed"
+        declared = {c.op for c in arch_caps.CAPABILITIES if c.backend == "hip"}
+        assert referenced <= declared, (
+            "benchmark registry names capability ops with no hip row: "
+            f"{sorted(referenced - declared)}"
+        )
+
     def test_known_bad_rows_explain_themselves(self):
         """A gate with no detail is unactionable for whoever hits it."""
         for cap in arch_caps.CAPABILITIES: